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- SU(1L) SU(1L)
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- NNAAMMEE
- su - run a shell with substitute user and group IDs
-
- SSYYNNOOPPSSIISS
- ssuu [-flmp] [-c command] [-s shell] [--login] [--fast]
- [--preserve-environment] [--command=command]
- [--shell=shell] [-] [user [arg...]]
-
- DDEESSCCRRIIPPTTIIOONN
- This manual page documents the GNU version of ssuu. ssuu
- allows one user to temporarily become another user. It
- runs a shell with the real and effective user ID, group
- ID, and supplemental groups of USER. If no USER is given,
- the default is root, the super-user. The shell run is
- taken from USER's password entry, or /bin/sh if none is
- specified there. If USER has a password, ssuu prompts for
- the password unless run by a user with real user ID 0 (the
- super-user).
-
- By default, ssuu does not change the current directory. It
- sets the environment variables `HOME' and `SHELL' from the
- password entry for USER, and if USER is not the super-
- user, sets `USER' and `LOGNAME' to USER. By default, the
- shell is not a login shell.
-
- If one or more ARGs are given, they are passed as addi-
- tional arguments to the shell.
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- ssuu does not handle /bin/sh or other shells specially (set-
- ting argv[0] to "-su", passing -c only to certain shells,
- etc.).
-
- On systems that have syslog, ssuu can be compiled to report
- failed, and optionally successful, ssuu attempts using sys-
- log.
-
- This program does not support a "wheel group" that
- restricts who can ssuu to super-user accounts, because that
- can help fascist system administrators hold unwarranted
- power over other users.
-
- OOPPTTIIOONNSS
- _-_, _-_l_, _-_-_l_o_g_i_n
- Make the shell a login shell. This means the fol-
- lowing. Unset all environment variables except
- `TERM', `HOME', and `SHELL' (which are set as
- described above), and `USER' and `LOGNAME' (which
- are set, even for the super-user, as described
- above), and set `PATH' to a compiled-in default
- value. Change to USER's home directory. Prepend
- "-" to the shell's name, to make it read its login
- startup file(s).
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- SU(1L) SU(1L)
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- _-_c _C_O_M_M_A_N_D_, _-_-_c_o_m_m_m_a_n_d_=_C_O_M_M_A_N_D
- Pass COMMAND, a single command line to run, to the
- shell with a _-_c option instead of starting an
- interactive shell.
-
- _-_f_, _-_-_f_a_s_t
- Pass the _-_f option to the shell. This probably
- only makes sense with ccsshh and ttccsshh, for which the
- _-_f option prevents reading the startup file
- (.cshrc). With Bourne-like shells, the _-_f option
- disables filename pattern expansion, which is not a
- generally desirable thing to do.
-
- _-_m_, _-_p_, _-_-_p_r_e_s_e_r_v_e_-_e_n_v_i_r_o_n_m_e_n_t
- Do not change the environment variables `HOME',
- `USER', `LOGNAME', or `SHELL'. Run the shell given
- in the environment variable `SHELL' instead of
- USER's shell from /etc/passwd, unless the user run-
- ning ssuu is not the superuser and USER's shell is
- restricted. A restricted shell is one that is not
- listed in the file /etc/shells, or in a compiled-in
- list if that file does not exist. Parts of what
- this option does can be overridden by _-_-_l_o_g_i_n and
- _-_-_s_h_e_l_l.
-
- _-_s_, _-_-_s_h_e_l_l _s_h_e_l_l
- Run SHELL instead of USER's shell from /etc/passwd,
- unless the user running ssuu is not the superuser and
- USER's shell is restricted.
-
- The long-named options can be introduced with `+' as well
- as `--', for compatibility with previous releases. Even-
- tually support for `+' will be removed, because it is
- incompatible with the POSIX.2 standard.
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