Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Variable usage
Top Forums UNIX for Dummies Questions & Answers Variable usage Post 302938783 by Scrutinizer on Thursday 19th of March 2015 01:20:08 AM
Old 03-19-2015
Hi, from man bash:
Quote:
The braces are required when parameter is a positional parameter with more than one digit, or when parameter is followed by a character which is not to be interpreted as part of its name.
For example
Code:
$ var=foo
$ echo "1. $var"
1. foo
$ echo "2. ${var}"
2. foo
$ echo "3. $varbar"
3. 
$ echo "4. ${var}bar"
4. foobar
$ 
$ set -- A B C D E F G H I J K L
$ echo "$1 $12"
A A2
$ echo "$1 ${12}"
A L

Last edited by Scrutinizer; 03-19-2015 at 02:28 AM..
This User Gave Thanks to Scrutinizer For This Post:
Raj999
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

usage of same variable in multiple scripts

Hi, I have a .test file which has: #!/bin/ksh export TEST_FLAG=1 In the test1.ksh i have: #!/bin/ksh . .test echo $TEST_FLAG When i execute the test1.ksh its showing the value as 1. But if i refer the same variable in another script, the value is not 1. Basically, I need to have... (1 Reply)
Discussion started by: risshanth
1 Replies

2. UNIX for Advanced & Expert Users

Usage of $ as variable name

Hi I have to use a Environment variable and that variable has $ prefixed to its name like, $var=/home/source/test/ i need to use the variable as i have show above. :confused: Help requested..... Thanks in advance... (6 Replies)
Discussion started by: shreekrishnagd
6 Replies

3. HP-UX

how can I find cpu usage memory usage swap usage and logical volume usage

how can I find cpu usage memory usage swap usage and I want to know CPU usage above X% and contiue Y times and memory usage above X % and contiue Y times my final destination is monitor process logical volume usage above X % and number of Logical voluage above can I not to... (3 Replies)
Discussion started by: alert0919
3 Replies

4. AIX

How to monitor the IBM AIX server for I/O usage,memory usage,CPU usage,network..?

How to monitor the IBM AIX server for I/O usage, memory usage, CPU usage, network usage, storage usage? (3 Replies)
Discussion started by: laknar
3 Replies

5. Shell Programming and Scripting

Confused with the usage of one variable usage

Hi All I am not able to understand the usage of d# in the below variable declaration. FILE_LOC contains the directory path And also help me to know about what will be saved in the variable j. Thanks!!! j=${d#${FILE_LOC}/} (2 Replies)
Discussion started by: mohanm
2 Replies

6. Shell Programming and Scripting

sed usage with Variable

Gurus, I am trying to display a match (single character) from beginning of the line in a file using a variable. I tried using sed ... not sure where am doing it wrong... sed -n "/^\$variable/p" FileName.shor sed -n "/^\${variable}/p" FileName.shBoth of the above are not working.....Thanks... (4 Replies)
Discussion started by: Kevin Tivoli
4 Replies

7. UNIX for Dummies Questions & Answers

Variable usage issue

Hi, I need a help in setting scope of the variable. I want to use the below logic right before the "break" statement if ; then echo $header echo $trailer fi But due the scope of the variable it is causing issues. I tried using "export" statement. But it changes the output completely ... (0 Replies)
Discussion started by: Prem148
0 Replies

8. Shell Programming and Scripting

Usage of shell variable in perl command

Hi, I have a shell script, In which i have variable "var1" and some perl command inside shell script. export var1='coep -n rst-a2p-hinje.vci.all.com -c' perl -pi -e 's/^/coep -n rst-a2p-hinje.vci.all.com -c /' command.txt currently I am adding value of var1 in command.txt file by... (2 Replies)
Discussion started by: rakeshtomar82
2 Replies

9. Shell Programming and Scripting

Usage of # in assignment of variable

guys, i would like to know what does the below does. tr=`echo $bfile | cut -d"." -f4` tr=${tr#TR} i tried with assigning a value and executed second line. but after that also value of tr remains same. thanks in advance .. (1 Reply)
Discussion started by: expert
1 Replies

10. Shell Programming and Scripting

Usage of a variable in awk BEGIN

Hi, diffcount=`awk 'BEGIN { while ( getline < "/scripts/matt/text.server1.reference" ) { arr++ } } { if (!( $0 in arr ) ) { print } }' $TMPDIR/$(basename $0 .sh) | wc -l` if ]; then OK="OK - No change in the interfaces status" elif ]; then DIFF=`awk 'BEGIN {... (4 Replies)
Discussion started by: nms
4 Replies

LEARN ABOUT XFREE86

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
All times are GMT -4. The time now is 09:19 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy