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Some do...some don't work.

ifconfig
-bash: ifconfig: command not found
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What kind of machines are they? What distro? – blauwblaatje Nov 1 '09 at 2:20
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Note that that error message indicates that the program couldn't be found, not that it didn't work. (There's a difference) – David Zaslavsky Nov 1 '09 at 6:05
I highly suggest getting out of the habit of using 'ifconfig' on Linux machines - it is deprecated in favour of iproute2 (ip <command>) – MikeyB Nov 1 '09 at 17:34
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3 Answers

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I think this is when ifconfig is in /usr/sbin which is not in a non-admin user's path. Try: 

/sbin/ifconfig

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You can also modify your PATH variable to include /sbin directory. – Misha M Nov 1 '09 at 2:39
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up vote 1 down vote

Redhat-based distros don't include much in root's path for (imho, misguided) security reasons. Add /sbin;/usr/sbin;/usr/local/sbin to your path, or just memorise where your commands are stored are and specify the paths when running.

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And, IIRC, neither do Debian based. – user24524 Nov 1 '09 at 15:18
Debian very definitely does Samix. – Lee B Nov 1 '09 at 23:51
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up vote 0 down vote

If you don't want to add to the path for security reasons (so as not to "expose" all executables in those directories) you could use shell aliases.

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