Comments on: Bourne/bash shell scripts: case statement

By: S.Raghu

S.Raghu — Sat, 13 Jun 2009 05:56:41 +0000

How to branch if the value of the variable is '*' ?
For eg parameters passed to a program are 2 numbers and an arithmetical operand.

By: newbie

newbie — Tue, 21 Apr 2009 02:29:40 +0000

stdin means “standard input” from the keyboard (file descriptor=0)
stdout means “standard output” to the computer screen (file descriptor=1)
stderr means “standard error”; output for error messages (file descriptor=2)

By: Ravi_Kiran

Ravi_Kiran — Wed, 31 Dec 2008 06:28:39 +0000

case "$1" in
stdin|
-)
commands
;;

What does stdin|
-) mean here?
Can somebody explain it?

By:

Wed, 14 Dec 2005 09:06:33 +0000

It’s possible to use even more complicated syntax with regular expressions:

case “$1″ in
+(start|run) ) /usr/app/startup-script ;;
@([Ss])top ) /usr/app/stop-script ;;
esac

?(pattern1 | pattern2 | … | patternn)
zero or one occurrence of any pattern

*( pattern1 | pattern2 | … | patternn)
zero or more occurrences of any pattern

@( pattern1 | pattern2 | … | patternn)
exactly one occurrence of any pattern

+( pattern1 | pattern2 | … | patternn)
one or more occurrence of any pattern

!( pattern1 | pattern2 | … | patternn)
all strings except those that match any pattern

By: Matir

Matir — Wed, 29 Jun 2005 12:40:45 +0000

Actually, that should be ‘*)’. If you look, it’s trying to give syntax for errors. restart would read like: 'restart') $0 stop $1 start ;;

By: for great restart

for great restart — Mon, 13 Jun 2005 14:48:07 +0000

there is an error in the second example

case "$1" in 'start') /usr/app/startup-script ;; 'stop') /usr/app/shutdown-script ;; --> 'start') <-- here error, should be restart echo "Usage: $0 [start|stop]" ;; esac

By: hpx

hpx — Wed, 08 Jun 2005 03:02:21 +0000

:lol:
good job!