Mar 6, 2009 . Here is a quick bash tip that might be useful if you need to use inside a bash

as a test operator if [ "$string1" = "$string2" ] then command fi # if [ "X$string1" .

bin/bash if test -f /etc/foo then # file exists, so copy and print a message. cp /etc/

An if/then construct tests whether the exit status of a list of commands is 0 (since 0

Mar 12, 2008 . A common problem I've come across in bash is that there doesn't seem to be a

Oct 4, 2010 . Is there a nice way of checking if an array has an element in bash (better than

Re: bash: checking if an env var is set? Angel Tsankov wrote: [ follow-up set to

I have found the code to do this before, and now I cannot remember nor find it

Jun 21, 2010 . Bash Example 1. Check File Existence. The following Bash shell script code-

Jan 6, 2009 . In bash, an If-structure always expects a boolean value (or a 1 or 0, don't know

Jun 21, 2010 . 4 Bash If Statement Examples ( If then fi, If then else fi, If elif else fi, Nested if ) . .

Sep 12, 2011 . Check if a value exists in an array # @param $1 mixed Needle # @param $2

I have devices that I have to FTP to and copy log files from. The log files have 3

Jan 28, 2009 . Linux/Bash: Check if a file exists - posted in Bash / Shell Scripting: I use this little

bin/bash # str-test.sh: Testing null strings and unquoted strings, #+ but not strings

The TEST-COMMAND list is executed, and if its return status is zero, the

May 12, 2009 . In Bash, using double square brackets, the quotes aren't necessary. You can

if. Conditionally perform a command. SYNTAX if test-commands ; then

Sep 23, 2007 . How to test if a bash script argument is an integer? test "$1" -ge 0 -o "$1" -lt 0 2>&

Test if a file exists with the BASH shell - Linux / Unix Webmaster Tips, Knowledge

May 30, 2010 . How can I tell (in ~/.bashrc ) if I'm running in interactive mode, or, say, executing a

Hello All, I'm using Xorg 6.8.2 and the new composite extension. The visual

This is an example of a bash script which checks for some running process (

Results 1 - 10 of 11 . The content of test.data is -bash-3.2# cat test.data line1 line2 line3 It is important

Jun 26, 2008 . bin/bash # Test an IP address for validity: # Usage: # valid_ip IP_ADDRESS # if [[

Subject: Re: [Help-bash] Syntax for if test. Date: Mon, 05 Dec 2011 08:59:41 -

Feb 20, 2007 . Linux tip: Bash test and comparison functions. Demystify test, [, [[, ((, and if-then-

Linuxtopia Books - Advanced Bash Shell Scripting Guide - Operators. . as a test

bin/bash X="" if [ -n $X ]; then # -n tests to see if the argument is non empty echo "

I'm trying to check if a symlink exists in bash. Here's what I've tried. . -L is

So, if VAR="var with spaces", you do not need to double quote $VAR in a test .

I know how to find out if a LAN IP address e.g., 192.168.1.9, is up with just a few

17 Responses to “Bourne/bash shell scripts: string comparison”. October 22,

Apr 27, 2011 . My problem is, I want a script which reads content from a pipe, checks if it's empty

Advanced Bash-Scripting Guide: Prev, Chapter 7. . This test option may be used

You've probably seen this before - even Excel's VBA has if tests! Here's where

How do you test if a string is a number? Trying to do something like this: x="AS" if(

Feb 3, 2011 . Please find below two UNIX bash scripts to test if the entered input is integer or

I would like to check if a string begins with "node" e.g. "node001". . This snippet

The expression is true if and only if the argument is not null. . The above applies

Nov 12, 2007 . Check the script is being run by root user. #!/bin/bash # Init FILE="/tmp/out.$$"

Mar 12, 2008 . Explains how to find out if a FILE exists and write permission is granted under

Nov 2, 2011 . Nested if/else. 10. Bash Comparisons. 10.1. Arithmetic Comparisons. 10.2. String

What command can be used to check if a directory does or does not exist, . @

Actually, more accurately, I'm looking to check if an element does not exist in an

Using this exit code, it's possible to let Bash react on the result of such a test, here

bash$ PROG="Bash" bash$ echo ${PROG:0} Bash bash$ echo ${PROG:1} ash

bin/bash if test $1 -gt 0 then echo "$1 > 0" fi if test $1 -ge 0 then echo "$1 >= 0" fi if

Aug 27, 2008 . Often when shell scripting with BASH you need to test if a file exists (or doesn't

Oct 27, 2008 . total crap, it doesn't actually test if the file is there or not, it just tests if the

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