SU(1) General Commands Manual SU(1) su - ID su [-flmp] [-c ] [-s ] [--login] [--fast] [--preserve-environment] [--command=] [--shell=] [-] [--help] [--version] [ [...]] GNU su . su . ID, ID, USER . USER root . USER /bin/sh . USER su ID 0 () . , su . USER `HOME', `SHELL' `USER' `LOGNAME' USER . . . su /bin/sh . (argv[0] "-su" -c ... ) syslog , su , su syslog . -c COMMAND, --command=COMMAND -c . -f, --fast -f . csh tcsh , -f (.cshrc) . , -f . --help . -, -l, --login . . `TERM', `HOME', `SHELL' ( ) `USER', `LOGNAME'( ) . `PATH' . USER . "-" . -m, -p, --preserve-environment `HOME', `USER', `LOGNAME', `SHELL' . su /etc/passwd USER `SHELL' . /etc/shells /etc/shells . --login --shell . -s, --shell shell su /etc/passwd USER . --version . FSF GNU SU(1)