Sponsored Content
Top Forums Shell Programming and Scripting Increment a variable in unix bash Post 302629153 by radoulov on Tuesday 24th of April 2012 11:17:55 AM
Old 04-24-2012
If you're running and old bash version, you'll need a bit different syntax:

Code:
$ bash -c 'echo $BASH_VERSION; (( c++ ))'
2.03.0(1)-release
bash: ((: c++ : syntax error: operand expected (error token is " ")
$ bash -c 'echo $BASH_VERSION; (( c += 1 )); echo $c'
2.03.0(1)-release
1

This User Gave Thanks to radoulov For This Post:
 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

increment a Variable

hi, i want to increment a Variable but it doesnt work. here my codé COUNT=1 COUNT= 'expr $COUNT + 1' i've tried it in the prompt but it print me: expr: syntaxerror What does I make wrong? (4 Replies)
Discussion started by: cengiz
4 Replies

2. Shell Programming and Scripting

Increment of a variable

Hi All, I have a variable n that stores a number. Eg. echo $n comes out to be 120. I need to print 121 using echo command on n. Please advice. Thanks in advance !! (4 Replies)
Discussion started by: learning_skills
4 Replies

3. UNIX for Dummies Questions & Answers

bash script to increment a digit in filename

Hi guys, Can someone help me out with this: I have a directory with files like the following, GHost++ 2010-03-14 04-01 DotaCash RD us_ca LC #7 (44m19s).w3g GHost++ 2010-03-14 04-06 DotaCash AP us_ca LC #8 (42m24s).w3g GHost++ 2010-03-14 04-07 DotaCash AR us_ca LC #10 (08m23s).w3g ... (4 Replies)
Discussion started by: hbjlee17
4 Replies

4. Shell Programming and Scripting

Variable increment (of some sort)

i have a variable that has more than one value. i am declaring another variable, which will have the old variable data one by one. i want to use the second variable to hold the track of all the variable it has parsed from the first one. can somebody help me how do i declare and use the second... (7 Replies)
Discussion started by: gopajitmalakar
7 Replies

5. Shell Programming and Scripting

Bash 4.0 increment variable

Hi there everyone! This is my first post so be gentle. I have a small bash script that is extracting 3 line every 3 lines. I got the AWK part but i cant do the loop part. #!/bin/bash export line=`awk 'END { print NR }' btnew` echo $line for i in {1..$line..3} #increment do echo... (2 Replies)
Discussion started by: theodorosGreece
2 Replies

6. Shell Programming and Scripting

How to increment a string variable?

Hi All, I am new to this forum and a novice at shell script. I am trying to write a script to determine each of the NIC configured on a linux system and its speed and Duplex. I came up with the following piece of code: echo `ifconfig -a | grep eth > /home/a/nic.txt` i=`awk -F, '{print... (4 Replies)
Discussion started by: pravin883
4 Replies

7. Shell Programming and Scripting

[Solved] How to increment and add variable length numbers to a variable in a loop?

Hi All, I have a file which has hundred of records with fixed number of fields. In each record there is set of 8 characters which represent the duration of that activity. I want to sum up the duration present in all the records for a report. The problem is the duration changes per record so I... (5 Replies)
Discussion started by: danish0909
5 Replies

8. Shell Programming and Scripting

Bash counter increment not working

Hi all, I'm using Bash 4.3.8 on an Ubuntu system, and no matter what I try, incrementing a counter won't work. The simplest example would be something like this: #!/bin/bash myVar=0 myVar=$((myVar++)) echo myVar The variable should be 1, but it's always 0. I've tried every increment... (6 Replies)
Discussion started by: Zel2008
6 Replies

9. Shell Programming and Scripting

Increment date variable

hey guys, I need to incerement the date variable for instance echo `date '+%F %H:%M:00'` this produces 2014-08-02 20:05:00 -I will grant this to : $Datehour and need to assign 1 hr from now to $Datelasthour -the script time will be used to talk to DB system information. however... (4 Replies)
Discussion started by: mo_VERTICASQL
4 Replies
BASHBUG(1)						      General Commands Manual							BASHBUG(1)

NAME
bashbug - report a bug in bash SYNOPSIS
bashbug [--version] [--help] [email-address] DESCRIPTION
bashbug is a shell script to help the user compose and mail bug reports concerning bash in a standard format. bashbug invokes the editor specified by the environment variable EDITOR on a temporary copy of the bug report format outline. The user must fill in the appropriate fields and exit the editor. bashbug then mails the completed report to bug-bash@gnu.org, or email-address. If the report cannot be mailed, it is saved in the file dead.bashbug in the invoking user's home directory. The bug report format outline consists of several sections. The first section provides information about the machine, operating system, the bash version, and the compilation environment. The second section should be filled in with a description of the bug. The third sec- tion should be a description of how to reproduce the bug. The optional fourth section is for a proposed fix. Fixes are encouraged. ENVIRONMENT
bashbug will utilize the following environment variables if they exist: EDITOR Specifies the preferred editor. If EDITOR is not set, bashbug defaults to emacs. HOME Directory in which the failed bug report is saved if the mail fails. TMPDIR Directory in which to create temporary files and directories. SEE ALSO
bash(1) AUTHORS
Brian Fox, Free Software Foundation bfox@gnu.org Chet Ramey, Case Western Reserve University chet@po.cwru.edu GNU Bash-4.0 1998 July 30 BASHBUG(1)
All times are GMT -4. The time now is 05:14 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy