Sponsored Content
Top Forums Shell Programming and Scripting Variable equal to zero Linux 2.6.32-300.39.2.el Post 302961231 by RudiC on Wednesday 25th of November 2015 01:11:18 PM
Old 11-25-2015
bash (and other bourne compatible shells): if [ -z $var ]; then ...; fi
This User Gave Thanks to RudiC For This Post:
 

6 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Making a variable equal a pattern

Hi, I would like to assign a pattern to a variable eg test8* or abc etc The problem I have is that when I assign the pattern to the variable, if any files within the current directory match the pattern then the variable will be evaluated to equal the filenames rather than the literal pattern.... (3 Replies)
Discussion started by: Bab00shka
3 Replies

2. Linux

Installation of Linux in 300 MHz with 128 MB ram

Hi I am very new to Linux, but very keen to learn it. I am having a desktop of 300 MHz with 128 MB RAM and 30 GB hard drive with Windows XP. My first question is - Is there any version/flavour of Linux available that can be installed on above system especially Fedora with less compromise... (6 Replies)
Discussion started by: sanjay1979
6 Replies

3. Shell Programming and Scripting

while [ $x -ge 50 ] + and equal to zero ; then

while + and equal to zero ; then what to punt instead of phrase and equal to zero. it's bash thank you in advance (1 Reply)
Discussion started by: losh
1 Replies

4. Shell Programming and Scripting

If not equal to then loop

How do I go about amending this simple script that prompts for a yes/no response so that if neither Y or N are entered it will loop back back to the original prompt #!/bin/ksh echo "Enter yes of no" read answer if then echo "You selected yes" elif then echo "You selected no" elif... (5 Replies)
Discussion started by: gmears
5 Replies

5. Shell Programming and Scripting

weird equal variable issue

I run this #!/bin/bash cron=$(ps aux | grep crond | grep -v grep | grep -o crond| uniq) echo "cron :$cron:" if ; then echo "OK: crond service running fine on `hostname`" exit 2 else echo "CRITICAL: crond service not running on `hostname`" exit 0... (2 Replies)
Discussion started by: anil510
2 Replies

6. Linux

Linux command to find and replace occurance of more than two equal sign with "==" from XML file.

Please help me, wasted hrs:wall:, to find this soulution:- I need a command that will work on file (xml) and replace multiple occurrence (more than 2 times) Examples 1. '===' 2. '====' 3. '=======' should be replaced by just '==' Note :- single character should be replaced. (=... (13 Replies)
Discussion started by: RedRocks!!
13 Replies
getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME
getusershell, setusershell, endusershell - get legal user shells SYNOPSIS
#include <unistd.h> char *getusershell(void); void setusershell(void); void endusershell(void); DESCRIPTION
The getusershell() function returns a pointer to a legal user shell as defined by the system manager in the file /etc/shells. If /etc/shells does not exist, the following locations of the standard system shells are used in its place: /bin/bash /bin/csh /bin/jsh /bin/ksh /bin/ksh93 /bin/pfcsh /bin/pfksh /bin/pfsh /bin/sh /bin/tcsh /bin/zsh /sbin/jsh /sbin/pfsh /sbin/sh /usr/bin/bash /usr/bin/csh /usr/bin/jsh /usr/bin/ksh /usr/bin/ksh93 /usr/bin/pfcsh /usr/bin/pfksh /usr/bin/pfsh /usr/bin/sh /usr/bin/tcsh /usr/bin/zsh /usr/sfw/bin/zsh /usr/xpg4/bin/sh The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells. The setusershell() function rewinds the file or the list. The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells. RETURN VALUES
The getusershell() function returns a null pointer on EOF. BUGS
All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved. NOTES
Restricted shells should not be listed in /etc/shells. SunOS 5.11 1 Nov 2007 getusershell(3C)
All times are GMT -4. The time now is 09:49 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy