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Full Discussion: Assigning variable from command outputs to shell
Top Forums Shell Programming and Scripting Assigning variable from command outputs to shell Post 302329445 by staze on Saturday 27th of June 2009 10:10:38 PM
Old 06-27-2009
Assigning variable from command outputs to shell
First, this is bash (3.2.17), on a Mac, 10.5.7.

What I'm trying to do is look at a list of users, and check to see if each exists. If they do, do some more stuff, if they don't, drop them into an error file.

So, my user list is:
foo - exists
bar - does not exist
blah - does not exist

K, so, here's the script:

Code:
#!/bin/bash

#This script will take two arguments, the group name, and the user list. 
#It is recommended that the group be cleared before running this script since
#it will not remove people from the group.

if [ "$#" != "2" ]; then
echo -e "Usage of the groupadd script: $0 groupname userlist\n"
exit 1
else

group="$1"
userlist="$2"

echo "Adding users in $userlist to group $group"

read -p 'Enter username with directory write : ' admin
read -p 'Enter password for user : ' -s password

echo "test user: $admin, test pass: $password"
echo "group: $group, userlist: $userlist"

for user in `cat $userlist`; do
	check=$(id -u $user | grep "no such user")
	if [ $check != NULL ]; then
		echo "blah"
		#echo "User $user does not exist!" 
	fi
done
fi

I am obviously going to do more. The issue is, the output from id ends up outputting to the shell, rather than "blah". So, in the case of bar and blah, I get:
"id: bar: no such user
id: blah: no such user"
output to the shell. Where, I'd THINK that I'd get the output:
"blah
blah"

Anyone got any idea what's wrong?

Thanks!
 

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LEARN ABOUT DEBIAN

surfraw-update-path

SURFRAW-UPDATE-PATH(1)					User Contributed Perl Documentation				    SURFRAW-UPDATE-PATH(1)

NAME

       surfraw-update-path - updates PATH in shell config files

SYNOPSIS

       surfraw-update-path [-add] [-remove] [-check] [-sys] [-all] [-help] [-shell=SHELL]

DESCRIPTION

       surfraw-update-path adds the surfraw elvi directory (/usr/lib/surfraw) to your PATH in your shell's config file.

       Currently it supports bash, sh, csh, tcsh, ash, dash, ksh, pdksh, zsh, rc, and es

       Don't forget to login again or source your login files for it to take effect.

OPTIONS

       -check
	   Checks to see if the surfraw config code is present.  This is the default.

       -add
	   Adds the surfraw config code.

       -remove
	   Removes the surfraw config code

       -sys
	   Updates the system-wide shell config instead of the user.  Must be done as root.

       -shell=SHELL
	   Selects the shell to configure. Defaults to the value of the $SHELL environment variable.

	   Currently supported shells are:

	   sh, ash, bash, dash, csh, tcsh, ksh, pdksh, zsh, rc, and es.

       -all
	   Attempts to configure the startup files for all known shells

       -help
	   Gives a usage message

RETURN VALUE

       -check returns 0 if the surfraw code is present in the file, 1 if it is not found, or 2 on error.

       All other options return 0 on success, or 2 on error.

ENVIRONMENT

       SHELL
	   Used to determine which shell to configure, if -shell is not given.

       HOME
	   Used to find users config files.

       ENV Used by posix-compliant shells to specify a startup rc file.

       ZDOTDIR
	   Used to find user config files for zsh. If not set, defaults to HOME.

SEE ALSO

       surfraw(1), sh(1), ash(1), bash(1), dash(1), csh(1), tcsh(1), ksh(1), pdksh(1), zsh(1), rc(1), es(1)

AUTHOR

       Ian Beckwith <ianb@erislabs.net>

perl v5.12.4							    2011-07-12						    SURFRAW-UPDATE-PATH(1)
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