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ls -li /bin/ksh
ls -li /bin/bash
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ls -li /etc/alternatives/ksh
The shell gives default values to PATH, PS1, PS2, PS3, PS4, MAILCHECK, FCEDIT, TMOUT and IFS, while HOME, SHELL, ENV, and MAIL are not set at all by the shell (although HOME is set by login(1)). On some systems MAIL and SHELL are also set by login(1).
ksh: shopt: not found [No such file or directory]
PID TTY TIME CMD
12533 pts/14 00:00:00 bash
13271 pts/14 00:00:00 ksh
13272 pts/14 00:00:00 ps
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