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Commit 82823300 authored by Michael Albinus's avatar Michael Albinus
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Some Tramp methods allow to change the remote login shell 

* doc/misc/tramp.texi (Inline methods) <sshx, plink, plinkx>:
(External methods) <scpx, pscp, psftp>: Mention, that the remote
login shell could be changed.
(Remote shell setup): Remove description of properties
"remote-shell-login" and "remote-shell-args", they don't matter
here.  Changing the default remote shell works only for some
methods.
(Frequently Asked Questions): Refer to alternative approach fixing
zsh problems.

* etc/NEWS: Some Tramp methods allow to change the remote login shell.

* lisp/net/tramp-sh.el (tramp-default-remote-shell): New defconst.
(tramp-methods): Use it.
(tramp-get-sh-extra-args): New defun.
(tramp-open-shell, tramp-maybe-open-connection): Use it.

* lisp/net/tramp.el (tramp-methods): Adapt docstring.
parent a6894cf0
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    doc/misc/tramp.texi
    View file @ 82823300
    ......@@ -805,7 +805,8 @@ behavior.
    Works like @option{ssh} but without the extra authentication prompts.
    @option{sshx} uses @samp{ssh -t -t @var{host} -l @var{user} /bin/sh}
    to open a connection with a ``standard'' login shell.
    to open a connection with a ``standard'' login shell. It supports to
    change the remote login shell @command{/bin/sh}.
    @strong{Note} that @option{sshx} does not bypass authentication
    questions. For example, if the host key of the remote host is not
    ......@@ -841,7 +842,8 @@ This is another method from the Kerberos suite. It behaves like @option{su}.
    @option{plink} method is for MS Windows users with the PuTTY
    implementation of SSH@. It uses @samp{plink -ssh} to log in to the
    remote host.
    remote host. It supports to change the remote login shell
    @command{/bin/sh}.
    Check the @samp{Share SSH connections if possible} control for that
    session.
    ......@@ -854,7 +856,8 @@ session.
    Another method using PuTTY on MS Windows with session names instead of
    host names. @option{plinkx} calls @samp{plink -load @var{session}
    -t}. User names and port numbers must be defined in the session.
    -t}. User names and port numbers must be defined in the session. It
    supports to change the remote login shell @command{/bin/sh}.
    Check the @samp{Share SSH connections if possible} control for that
    session.
    ......@@ -928,7 +931,8 @@ This method supports the @samp{-p} argument.
    @option{scpx} is useful to avoid login shell questions. It is similar
    in performance to @option{scp}. @option{scpx} uses @samp{ssh -t -t
    @var{host} -l @var{user} /bin/sh} to open a connection.
    @var{host} -l @var{user} /bin/sh} to open a connection. It supports
    to change the remote login shell @command{/bin/sh}.
    @option{scpx} is useful for MS Windows users when @command{ssh}
    triggers an error about allocating a pseudo tty. This happens due to
    ......@@ -952,6 +956,8 @@ use the @command{plink} command to connect to the remote host, and
    they use @command{pscp} or @command{psftp} for transferring the files.
    These programs are part of PuTTY, an SSH implementation for MS Windows.
    They support to change the remote login shell @command{/bin/sh}.
    Check the @samp{Share SSH connections if possible} control for that
    session.
    ......@@ -2100,12 +2106,10 @@ be recomputed. To force @value{tramp} to recompute afresh, call
    @cindex zsh setup
    Per default, @value{tramp} uses the command @command{/bin/sh} for
    strting a shell on the remote host. This can be changed by setting
    starting a shell on the remote host. This can be changed by setting
    the connection property @option{remote-shell}, see @xref{Predefined
    connection information}. Other properties might be adapted as well,
    like @option{remote-shell-login} or @option{remote-shell-args}. If
    you want, for example, use @command{/usr/bin/zsh} on a remote host,
    you might apply
    connection information}. If you want, for example, use
    @command{/usr/bin/zsh} on a remote host, you might apply
    @lisp
    @group
    ......@@ -2115,6 +2119,11 @@ you might apply
    @end group
    @end lisp
    This works only for connection methods which allow to override the
    remote login shell, like @option{sshx} or @option{plink}. See
    @ref{Inline methods} and @ref{External methods} for connection methods
    which support this.
    This approach has also the advantage, that settings in
    @code{tramp-sh-extra-args} will be applied. For zsh, the trouble
    with the shell prompt due to set zle options will be avoided.
    ......@@ -3766,6 +3775,9 @@ This uses the default value of @code{tramp-terminal-type},
    you want to use another value for @env{TERM}, change
    @code{tramp-terminal-type} and this line accordingly.
    Alternatively, you could set the remote login shell explicitly. See
    @ref{Remote shell setup} for discussing this technique,
    When using fish shell on remote hosts, disable fancy formatting by
    adding the following to @file{~/.config/fish/config.fish}:
    ......
    etc/NEWS
    View file @ 82823300
    ......@@ -1530,6 +1530,12 @@ names are adjusted to the host name from the previous hop.
    timeout, after which the underlying session is disabled. This is for
    security reasons.
    +++
    *** For some connection methods, like "sshx" or "plink", it is
    possible to configure the remote login shell. This avoids problems
    with remote hosts, where "/bin/sh" is a link to a shell which
    cooperates badly with Tramp.
    ** Rcirc
    ---
    ......
    lisp/net/tramp-sh.el
    View file @ 82823300
    ......@@ -37,6 +37,10 @@
    (defvar vc-git-program)
    (defvar vc-hg-program)
    ;;;###tramp-autoload
    (defconst tramp-default-remote-shell "/bin/sh"
    "The default remote shell Tramp applies.")
    ;;;###tramp-autoload
    (defcustom tramp-inline-compress-start-size 4096
    "The minimum size of compressing where inline transfer.
    ......@@ -132,10 +136,10 @@ The string is used in `tramp-methods'.")
    ;;;###tramp-autoload
    (tramp--with-startup
    (add-to-list 'tramp-methods
    '("rcp"
    `("rcp"
    (tramp-login-program "rsh")
    (tramp-login-args (("%h") ("-l" "%u")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))
    (tramp-copy-program "rcp")
    ......@@ -143,35 +147,37 @@ The string is used in `tramp-methods'.")
    (tramp-copy-keep-date t)
    (tramp-copy-recursive t)))
    (add-to-list 'tramp-methods
    '("remcp"
    `("remcp"
    (tramp-login-program "remsh")
    (tramp-login-args (("%h") ("-l" "%u")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))
    (tramp-copy-program "rcp")
    (tramp-copy-args (("-p" "%k")))
    (tramp-copy-keep-date t)))
    (add-to-list 'tramp-methods
    '("scp"
    `("scp"
    (tramp-login-program "ssh")
    (tramp-login-args (("-l" "%u") ("-p" "%p") ("%c")
    ("-e" "none") ("%h")))
    (tramp-async-args (("-q")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))
    (tramp-copy-program "scp")
    (tramp-copy-args (("-P" "%p") ("-p" "%k") ("-q") ("-r") ("%c")))
    (tramp-copy-args (("-P" "%p") ("-p" "%k") ("-q")
    ("-r") ("%c")))
    (tramp-copy-keep-date t)
    (tramp-copy-recursive t)))
    (add-to-list 'tramp-methods
    '("scpx"
    `("scpx"
    (tramp-login-program "ssh")
    (tramp-login-args (("-l" "%u") ("-p" "%p") ("%c")
    ("-e" "none") ("-t" "-t") ("%h") ("/bin/sh")))
    ("-e" "none") ("-t" "-t") ("%h")
    ("%l")))
    (tramp-async-args (("-q")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))
    (tramp-copy-program "scp")
    ......@@ -180,64 +186,66 @@ The string is used in `tramp-methods'.")
    (tramp-copy-keep-date t)
    (tramp-copy-recursive t)))
    (add-to-list 'tramp-methods
    '("rsync"
    `("rsync"
    (tramp-login-program "ssh")
    (tramp-login-args (("-l" "%u") ("-p" "%p") ("%c")
    ("-e" "none") ("%h")))
    (tramp-async-args (("-q")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))
    (tramp-copy-program "rsync")
    (tramp-copy-args (("-t" "%k") ("-p") ("-r") ("-s") ("-c")))
    (tramp-copy-args (("-t" "%k") ("-p") ("-r") ("-s")
    ("-c")))
    (tramp-copy-env (("RSYNC_RSH") ("ssh" "%c")))
    (tramp-copy-keep-date t)
    (tramp-copy-keep-tmpfile t)
    (tramp-copy-recursive t)))
    (add-to-list 'tramp-methods
    '("rsh"
    `("rsh"
    (tramp-login-program "rsh")
    (tramp-login-args (("%h") ("-l" "%u")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))))
    (add-to-list 'tramp-methods
    '("remsh"
    `("remsh"
    (tramp-login-program "remsh")
    (tramp-login-args (("%h") ("-l" "%u")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))))
    (add-to-list 'tramp-methods
    '("ssh"
    `("ssh"
    (tramp-login-program "ssh")
    (tramp-login-args (("-l" "%u") ("-p" "%p") ("%c")
    ("-e" "none") ("%h")))
    (tramp-async-args (("-q")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))))
    (add-to-list 'tramp-methods
    '("sshx"
    `("sshx"
    (tramp-login-program "ssh")
    (tramp-login-args (("-l" "%u") ("-p" "%p") ("%c")
    ("-e" "none") ("-t" "-t") ("%h") ("/bin/sh")))
    ("-e" "none") ("-t" "-t") ("%h")
    ("%l")))
    (tramp-async-args (("-q")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))))
    (add-to-list 'tramp-methods
    '("telnet"
    `("telnet"
    (tramp-login-program "telnet")
    (tramp-login-args (("%h") ("%p") ("2>/dev/null")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))))
    (add-to-list 'tramp-methods
    '("nc"
    `("nc"
    (tramp-login-program "telnet")
    (tramp-login-args (("%h") ("%p") ("2>/dev/null")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))
    (tramp-copy-program "nc")
    ......@@ -247,24 +255,25 @@ The string is used in `tramp-methods'.")
    ;; We use "-p" as required for newer busyboxes. For older
    ;; busybox/nc versions, the value must be (("-l") ("%r")). This
    ;; can be achieved by tweaking `tramp-connection-properties'.
    (tramp-remote-copy-args (("-l") ("-p" "%r") ("2>/dev/null")))))
    (tramp-remote-copy-args (("-l") ("-p" "%r")
    ("2>/dev/null")))))
    (add-to-list 'tramp-methods
    '("su"
    `("su"
    (tramp-login-program "su")
    (tramp-login-args (("-") ("%u")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))
    (tramp-connection-timeout 10)))
    (add-to-list 'tramp-methods
    '("sg"
    `("sg"
    (tramp-login-program "sg")
    (tramp-login-args (("-") ("%u")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-args ("-c"))
    (tramp-connection-timeout 10)))
    (add-to-list 'tramp-methods
    '("sudo"
    `("sudo"
    (tramp-login-program "sudo")
    ;; The password template must be masked. Otherwise,
    ;; it could be interpreted as password prompt if the
    ......@@ -273,46 +282,47 @@ The string is used in `tramp-methods'.")
    ("-p" "P\"\"a\"\"s\"\"s\"\"w\"\"o\"\"r\"\"d\"\":")))
    ;; Local $SHELL could be a nasty one, like zsh or
    ;; fish. Let's override it.
    (tramp-login-env (("SHELL") ("/bin/sh")))
    (tramp-remote-shell "/bin/sh")
    (tramp-login-env (("SHELL")
    (,tramp-default-remote-shell)))
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))
    (tramp-connection-timeout 10)
    (tramp-session-timeout 300)))
    (add-to-list 'tramp-methods
    '("doas"
    `("doas"
    (tramp-login-program "doas")
    (tramp-login-args (("-u" "%u") ("-s")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-args ("-c"))
    (tramp-connection-timeout 10)
    (tramp-session-timeout 300)))
    (add-to-list 'tramp-methods
    '("ksu"
    `("ksu"
    (tramp-login-program "ksu")
    (tramp-login-args (("%u") ("-q")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))
    (tramp-connection-timeout 10)))
    (add-to-list 'tramp-methods
    '("krlogin"
    `("krlogin"
    (tramp-login-program "krlogin")
    (tramp-login-args (("%h") ("-l" "%u") ("-x")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))))
    (add-to-list 'tramp-methods
    `("plink"
    (tramp-login-program "plink")
    (tramp-login-args (("-l" "%u") ("-P" "%p") ("-ssh") ("-t")
    ("%h") ("\"")
    (tramp-login-args (("-l" "%u") ("-P" "%p") ("-ssh")
    ("-t") ("%h") ("\"")
    (,(format
    "env 'TERM=%s' 'PROMPT_COMMAND=' 'PS1=%s'"
    tramp-terminal-type
    tramp-initial-end-of-output))
    ("/bin/sh") ("\"")))
    (tramp-remote-shell "/bin/sh")
    ("%l") ("\"")))
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))))
    (add-to-list 'tramp-methods
    ......@@ -323,50 +333,50 @@ The string is used in `tramp-methods'.")
    "env 'TERM=%s' 'PROMPT_COMMAND=' 'PS1=%s'"
    tramp-terminal-type
    tramp-initial-end-of-output))
    ("/bin/sh") ("\"")))
    (tramp-remote-shell "/bin/sh")
    ("%l") ("\"")))
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))))
    (add-to-list 'tramp-methods
    `("pscp"
    (tramp-login-program "plink")
    (tramp-login-args (("-l" "%u") ("-P" "%p") ("-ssh") ("-t")
    ("%h") ("\"")
    (tramp-login-args (("-l" "%u") ("-P" "%p") ("-ssh")
    ("-t") ("%h") ("\"")
    (,(format
    "env 'TERM=%s' 'PROMPT_COMMAND=' 'PS1=%s'"
    tramp-terminal-type
    tramp-initial-end-of-output))
    ("/bin/sh") ("\"")))
    (tramp-remote-shell "/bin/sh")
    ("%l") ("\"")))
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))
    (tramp-copy-program "pscp")
    (tramp-copy-args (("-l" "%u") ("-P" "%p") ("-scp") ("-p" "%k")
    ("-q") ("-r")))
    (tramp-copy-args (("-l" "%u") ("-P" "%p") ("-scp")
    ("-p" "%k") ("-q") ("-r")))
    (tramp-copy-keep-date t)
    (tramp-copy-recursive t)))
    (add-to-list 'tramp-methods
    `("psftp"
    (tramp-login-program "plink")
    (tramp-login-args (("-l" "%u") ("-P" "%p") ("-ssh") ("-t")
    ("%h") ("\"")
    (tramp-login-args (("-l" "%u") ("-P" "%p") ("-ssh")
    ("-t") ("%h") ("\"")
    (,(format
    "env 'TERM=%s' 'PROMPT_COMMAND=' 'PS1=%s'"
    tramp-terminal-type
    tramp-initial-end-of-output))
    ("/bin/sh") ("\"")))
    (tramp-remote-shell "/bin/sh")
    ("%l") ("\"")))
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-c"))
    (tramp-copy-program "pscp")
    (tramp-copy-args (("-l" "%u") ("-P" "%p") ("-sftp") ("-p" "%k")
    ("-q")))
    (tramp-copy-args (("-l" "%u") ("-P" "%p") ("-sftp")
    ("-p" "%k") ("-q")))
    (tramp-copy-keep-date t)))
    (add-to-list 'tramp-methods
    '("fcp"
    `("fcp"
    (tramp-login-program "fsh")
    (tramp-login-args (("%h") ("-l" "%u") ("sh" "-i")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell ,tramp-default-remote-shell)
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args ("-i") ("-c"))
    (tramp-copy-program "fcp")
    ......@@ -778,7 +788,8 @@ my $data;
    while (read STDIN, $data, 54) {
    my $pad = q();
    # Only for the last chunk, and only if did not fill the last three-byte packet
    # Only for the last chunk, and only if did not fill the last
    # three-byte packet
    if (eof) {
    my $mod = length($data) %% 3;
    $pad = q(=) x (3 - $mod) if $mod;
    ......@@ -4023,19 +4034,22 @@ file exists and nonzero exit status otherwise."
    vec 'file-error "Couldn't find command to check if file exists"))
    result))
    (defun tramp-get-sh-extra-args (shell)
    "Find extra args for SHELL."
    (let ((alist tramp-sh-extra-args)
    item extra-args)
    (while (and alist (null extra-args))
    (setq item (pop alist))
    (when (string-match-p (car item) shell)
    (setq extra-args (cdr item))))
    extra-args))
    (defun tramp-open-shell (vec shell)
    "Opens shell SHELL."
    (with-tramp-progress-reporter
    vec 5 (format-message "Opening remote shell `%s'" shell)
    ;; Find arguments for this shell.
    (let ((alist tramp-sh-extra-args)
    item extra-args)
    (while (and alist (null extra-args))
    (setq item (pop alist))
    (when (string-match-p (car item) shell)
    (setq extra-args (cdr item))))
    ;; It is useful to set the prompt in the following command
    ;; because some people have a setting for $PS1 which /bin/sh
    (let ((extra-args (tramp-get-sh-extra-args shell)))
    ;; doesn't know about and thus /bin/sh will display a strange
    ;; prompt. For example, if $PS1 has "${CWD}" in the value, then
    ;; ksh will display the current working directory but /bin/sh
    ......@@ -4894,6 +4908,9 @@ connection if a previous connection has died for some reason."
    (tramp-get-method-parameter hop 'tramp-login-program))
    (login-args
    (tramp-get-method-parameter hop 'tramp-login-args))
    (remote-shell
    (tramp-get-method-parameter hop 'tramp-remote-shell))
    (extra-args (tramp-get-sh-extra-args remote-shell))
    (login-env
    (tramp-get-method-parameter hop 'tramp-login-env))
    (async-args
    ......@@ -4971,7 +4988,8 @@ connection if a previous connection has died for some reason."
    spec (format-spec-make ?t tmpfile)
    options (format-spec options spec)
    spec (format-spec-make
    ?h l-host ?u l-user ?p l-port ?c options)
    ?h l-host ?u l-user ?p l-port ?c options
    ?l (concat remote-shell " " extra-args))
    command
    (concat
    ;; We do not want to see the trailing local
    ......@@ -5320,7 +5338,7 @@ Nonexistent directories are removed from spec."
    (progn
    (tramp-message
    vec 3
    "`getconf PATH' not successful, using default value \"%s\"."
    "`getconf PATH' not successful, using default value \"%s\"."
    "/bin:/usr/bin")
    "/bin:/usr/bin"))))
    (own-remote-path
    ......@@ -5894,9 +5912,6 @@ function cell is returned to be applied on a buffer."
    ;; way of passing credentials, like by using an SSL socket or
    ;; something. (David Kastrup)
    ;;
    ;; * Reconnect directly to a compliant shell without first going
    ;; through the user's default shell. (Pete Forman)
    ;;
    ;; * Avoid the local shell entirely for starting remote processes. If
    ;; so, I think even a signal, when delivered directly to the local
    ;; SSH instance, would correctly be propagated to the remote process
    ......
    lisp/net/tramp.el
    View file @ 82823300
    ......@@ -212,22 +212,32 @@ pair of the form (KEY VALUE). The following KEYs are defined:
    * `tramp-login-args'
    This specifies the list of arguments to pass to the above
    mentioned program. Please note that this is a list of list of arguments,
    that is, normally you don't want to put \"-a -b\" or \"-f foo\"
    here. Instead, you want a list (\"-a\" \"-b\"), or (\"-f\" \"foo\").
    There are some patterns: \"%h\" in this list is replaced by the host
    name, \"%u\" is replaced by the user name, \"%p\" is replaced by the
    port number, and \"%%\" can be used to obtain a literal percent character.
    If a list containing \"%h\", \"%u\" or \"%p\" is unchanged during
    expansion (i.e. no host or no user specified), this list is not used as
    argument. By this, arguments like (\"-l\" \"%u\") are optional.
    \"%t\" is replaced by the temporary file name produced with
    `tramp-make-tramp-temp-file'. \"%k\" indicates the keep-date
    parameter of a program, if exists. \"%c\" adds additional
    `tramp-ssh-controlmaster-options' options for the first hop.
    The existence of `tramp-login-args', combined with the absence of
    `tramp-copy-args', is an indication that the method is capable of
    multi-hops.
    mentioned program. Please note that this is a list of list
    of arguments, that is, normally you don't want to put \"-a
    -b\" or \"-f foo\" here. Instead, you want a list (\"-a\"
    \"-b\"), or (\"-f\" \"foo\"). There are some patterns:
    - \"%h\" in this list is replaced by the host name
    - \"%u\" is replaced by the user name
    - \"%p\" is replaced by the port number
    - \"%%\" can be used to obtain a literal percent character.
    If a list containing \"%h\", \"%u\" or \"%p\" is unchanged
    during expansion (i.e. no host, no user or no port
    specified), this list is not used as argument. By this,
    arguments like (\"-l\" \"%u\") are optional.
    - \"%l\" is replaced by the login shell `tramp-remote-shell'
    and its parameters.
    - \"%t\" is replaced by the temporary file name produced with
    `tramp-make-tramp-temp-file'.
    - \"%k\" indicates the keep-date parameter of a program, if exists
    - \"%c\" adds additional `tramp-ssh-controlmaster-options'
    options for the first hop.
    The existence of `tramp-login-args', combined with the
    absence of `tramp-copy-args', is an indication that the
    method is capable of multi-hops.
    * `tramp-login-env'
    A list of environment variables and their values, which will
    ......@@ -327,6 +337,9 @@ inline method, then these two parameters should be nil.
    Notes:
    All these arguments can be overwritten by connection properties.
    See Info node `(tramp) Predefined connection information'.
    When using `su' or `sudo' the phrase \"open connection to a remote
    host\" sounds strange, but it is used nevertheless, for consistency.
    No connection is opened to a remote host, but `su' or `sudo' is
    ......
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