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What is on Your Mind?
Quest for the most useless command
Post 302882166 by radoulov on Saturday 4th of January 2014 06:20:07 PM
01-04-2014
Quote:
Code:
[root ~]# for _sh in bash ksh mksh dash zsh; do
printf '%s: %s\n' "$_sh" "$("$_sh" -c 'type true')"
done
bash: true is a shell builtin
ksh: true is a shell builtin
mksh: true is a shell builtin
dash: true is a shell builtin
zsh: true is a shell builtin
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LEARN ABOUT OSF1
true
true(1) General Commands Manual true(1) NAME
true, false - Returns a standard exit value SYNOPSIS
true false STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: true: XCU5.0 false: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. DESCRIPTION
The true command returns a 0 (zero) exit value. The false command returns a nonzero exit value. These commands are usually used in input to shell commands. NOTES
The special built-in utility : (colon) is sometimes more efficient than the true command. EXIT STATUS
[Tru64 UNIX] The nonzero value returned by the false command may vary from system to system. EXAMPLES
To construct a loop in a shell procedure, enter: while true do date sleep 60 done This procedure displays the date and time once a minute. To stop it, press the Interrupt key sequence. SEE ALSO
Commands: csh(1), ksh(1), Bourne Shell sh(1b), POSIX shell sh(1p) Standards: standards(5) true(1)