Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Shell syntax
Top Forums Shell Programming and Scripting Shell syntax Post 302243890 by cfajohnson on Monday 6th of October 2008 07:20:43 PM
Old 10-06-2008
Quote:
Originally Posted by redstone
No, that's why I'm posting here. If you take look any commercial scripts, you will see that a lot in while, if statements.

I've never seen it used in while or if statments. I've seen it in test statements ([ is synonymous with test) and in arguments to expr.

When I have seen it, it has never been used the way you show it; the X is placed before the variable or string.

It is done to avoid ambiguity (e.g., when the value begins with a hyphen) or an empty string.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Help with a shell syntax

I have a variable named "xyz" Now what will the below snippet mean: if ( ${?xyz} ) then .... endif What does ? signify here. Thanks (12 Replies)
Discussion started by: vibhor_agarwali
12 Replies

2. Shell Programming and Scripting

syntax of c shell

i have this program in bash shell: #!/bin/bash array=(20 20 20 20 20) i=0 j=0 awk '/%/ {print $3}' try.txt| while (read s) arr=$s i=`expr $i + 1` echo "$i" end how can i convert this into c shell? (1 Reply)
Discussion started by: npatwardhan
1 Replies

3. Shell Programming and Scripting

Help Syntax Shell-Script

Hi Guys, iīve a question ... but itīs a litte bit tricky: iīve a 3 php-scripts which runīs via cron at night. These script reads an xml-file a writes it in an MySQL-DB. I named them (for example here ) Script1 - Script3. The XML-Files i named xml1 - xml3. Now, iīve build a Batch-file,... (10 Replies)
Discussion started by: jackcracker
10 Replies

4. Shell Programming and Scripting

Shell advanced syntax?

I am not an expert of shell scripting, but I can do some simple things. Now, I read a script written by others and I need some help from the experts of this forum. Please help me to understand what is going on in this cycle: if ; then ] && \ export... (25 Replies)
Discussion started by: alt
25 Replies

5. Shell Programming and Scripting

syntax error in shell script

I am creating a shell script. In which, I need to get server name and server IP. I used this command in script. servername=`cat /etc/hosts|grep `eval hostname`|awk '{print $2}'` however, when execute script or put set -x to debug, it return: line 13: syntax error at line 13: `|' unexpected... (4 Replies)
Discussion started by: duke0001
4 Replies

6. Shell Programming and Scripting

Help with if statement syntax in shell script

I want to make the file test condition a variable ($Prmshn in code below). My goal is to use something like the first three unsuccessful if statetments since the 'if #!/bin/ksh test_input() { Prmshn=${1} InFLNm=${2} ifReq="-$Prmshn $InFLNm" #the following three if statments fail: #if ] ;... (10 Replies)
Discussion started by: ms63707
10 Replies

7. UNIX for Beginners Questions & Answers

Need help to convert syntax to shell

Hi Folks - I need help converting a piece of code from batch to bash. Here is the code: FOR /f "eol=; tokens=1,2,3,4 delims=, " %%i in (Update_Subvars.txt) do ( ECHO alter database %%i.%%j set variable %%k %%l; ) What it's doing is retrieving the values from this file: ... (2 Replies)
Discussion started by: SIMMS7400
2 Replies

8. Shell Programming and Scripting

Shell scripting syntax

mydate ="$(date)" what is the use of adding double code and parenthesis in the above code .. can i write the same code as mydate= $date (5 Replies)
Discussion started by: lobsang
5 Replies

9. Shell Programming and Scripting

Shell scripting syntax error in if then else

I have one bash shell script to execute table refreshment. At the bottom of script, I have one piece of code to check 'ORA-' error from log file, then send email to DBA or application people. But this piece of code didn't work. I tried different ways and also search online to find where is my... (2 Replies)
Discussion started by: duke0001
2 Replies

10. UNIX for Beginners Questions & Answers

Syntax error C shell

Hello, I have a newbe syntax error but I cant find it syntax error: unexpected end of file #!/bin/csh # pe request #$ -pe mpi_16 32 #### 16 core : 'mpi_16 16' || 24 core : 'mpi_24 24 ' # our Job name #$ -N test2MD #$ -S /bin/sh (1 Reply)
Discussion started by: dulceC
1 Replies

LEARN ABOUT CENTOS

pacmd

pacmd(1)						      General Commands Manual							  pacmd(1)

NAME

       pacmd - Reconfigure a PulseAudio sound server during runtime

SYNOPSIS

       pacmd

       pacmd --help

       pacmd --version

DESCRIPTION

       This  tool  can	be used to introspect or reconfigure a running PulseAudio sound server during runtime. It connects to the sound server and
       offers a simple live shell that can be used to enter the commands also understood in the default.pa configuration scripts.

       To exit the live shell, use ctrl+d. Note that the 'exit' command inside the shell will tell the PulseAudio daemon itself to shutdown!

       If any arguments are passed on the command line, they will be passed into the live shell which will process the command and exit.

OPTIONS

       -h | --help
	      Show help.

       --version
	      Show version information.

AUTHORS

       The PulseAudio Developers <pulseaudio-discuss (at) lists (dot) freedesktop (dot) org>; PulseAudio is available from http://pulseaudio.org/

SEE ALSO

       pulse-cli-syntax(5), pulseaudio(1), pactl(1), default.pa(5)

Manuals 							       User								  pacmd(1)
All times are GMT -4. The time now is 03:04 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy