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Old 02-24-2004, 12:15 PM   #1
lugoteehalt
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Registered: Sep 2003
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A strange thing happened with !


Tested a piece of a shell script at the command line and got an odd and interesting-looking result. (Incidentally I realise there should be a space between the ! and $.)

Question is: Why does the first line give the output it does - the second and thrid lines?

lugo@debian:~$ if [ !$filth ]; then echo 'smegma'; fi
if [ fifilth ]; then echo 'smegma'; fi
smegma
lugo@debian:~$ echo $filth
2
lugo@debian:~$
lugo@debian:~$ echo !$filth
echo Ffilth
Ffilth
lugo@debian:~$ echo !
!
lugo@debian:~$ echo !$
echo !
!

Thanks any help.
 
Old 02-24-2004, 02:39 PM   #2
david_ross
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I think !$ contains the last command used in the bash shell. This should be in the bash man page.
 
Old 02-24-2004, 02:47 PM   #3
frieza
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he's right... look up the 'history' command (info history, NOT man hisory) the
!X will pull up command X in the history....
 
Old 02-26-2004, 05:59 AM   #4
lugoteehalt
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Thanks - that's very interesting.
 
  


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