N nORKy Apr 15, 2011 #1 What does ":" mean in sh scripts ? ex: : ${mysql_limits="NO"} Click to expand...
graudeejs Apr 15, 2011 #3 if it was something like Code: $mysql_limits=${mysql_limits:-"NO"} Then it would mean: set mysql_limits to NO if it's not defined already
if it was something like Code: $mysql_limits=${mysql_limits:-"NO"} Then it would mean: set mysql_limits to NO if it's not defined already
SirDice Administrator Staff member Administrator Moderator Apr 15, 2011 #4 killasmurf86 said: The entire statement is invalid Click to expand... No, it's not. It's even defined as a POSIX standard. The : (colon) means do nothing except expanding arguments and redirections. The return status is always 0.
killasmurf86 said: The entire statement is invalid Click to expand... No, it's not. It's even defined as a POSIX standard. The : (colon) means do nothing except expanding arguments and redirections. The return status is always 0.
SirDice Administrator Staff member Administrator Moderator Apr 15, 2011 #5 I couldn't find an explanation on a short notice but I did find this, perfectly legal, shell script: Code: :(){ :|:& };: WARNING WARNING WARNING Do not run this on your production system(s)!!!
I couldn't find an explanation on a short notice but I did find this, perfectly legal, shell script: Code: :(){ :|:& };: WARNING WARNING WARNING Do not run this on your production system(s)!!!
P pbd Apr 15, 2011 #6 SirDice said: WARNING WARNING WARNING Do not run this on your production system(s)!!! Click to expand... I would rather say, don't run it at all..
SirDice said: WARNING WARNING WARNING Do not run this on your production system(s)!!! Click to expand... I would rather say, don't run it at all..
SirDice Administrator Staff member Administrator Moderator Apr 15, 2011 #8 killasmurf86 said: looks like fork bomb (not sure) Click to expand... It is :e
UNIXgod Apr 15, 2011 #9 SirDice said: I couldn't find an explanation on a short notice but I did find this, perfectly legal, shell script: Code: :(){ :|:& };: WARNING WARNING WARNING Do not run this on your production system(s)!!! Click to expand... But it smiles at you. must ... resist ... exec arbitrary code ... The fork bomb is pretty famous. I posted it once on irc after being reminded of it on slashdots stupid unix tricks (http://ask.slashdot.org/story/08/11/05/2027234/Useful-Stupid-Unix-Tricks) None the less one of the mods asked me to never post such a thing again... ever =)
SirDice said: I couldn't find an explanation on a short notice but I did find this, perfectly legal, shell script: Code: :(){ :|:& };: WARNING WARNING WARNING Do not run this on your production system(s)!!! Click to expand... But it smiles at you. must ... resist ... exec arbitrary code ... The fork bomb is pretty famous. I posted it once on irc after being reminded of it on slashdots stupid unix tricks (http://ask.slashdot.org/story/08/11/05/2027234/Useful-Stupid-Unix-Tricks) None the less one of the mods asked me to never post such a thing again... ever =)
