Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Modifying a variable value
Top Forums UNIX for Dummies Questions & Answers Modifying a variable value Post 302195181 by era on Wednesday 14th of May 2008 01:29:08 PM
Old 05-14-2008
It's not at all clear what concept you are looking for. Perhaps you could elaborate on that a bit. In the meantime, here are some hopefully useful exercises.

Code:
var2=$var1   #copy var1 to var2
var2=${var2%abcd}  # trim abcd from end, if present
var2=`echo "$var2" | tr ' ' '\012' | sort | uniq | tr '\012' ' '` # remove duplicate tokens

The token duplicate removal is probably quite different from what you are imagining it would be, and has the unfortunate side effect of sorting the remaining tokens. In this case it doesn't matter, because they were already sorted, but nevertheless it's not a good general-purpose solution if the order of tokens is significant.

Perhaps you should read a tutorial on shell programming at this point; there's a lot of things you can do with variable substitution (${var%trim} is but a single example).
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Modifying $PATH variable in /etc/profile

In my /etc/profile, my $PATH variable is set as follows: $PATH =/sbin:/usr/sbin:/usr/bin:/etc Then how do I add an additional directory to it? say /export/home/abd/rose Please advise. Thanks! Deepali (3 Replies)
Discussion started by: Deepali
3 Replies

2. IP Networking

Modifying Route

hello, I have to communicate with a distant station . But Both belong to the same area. So I do not need a gate . But when I make a traceroute, it indicates that I pass through out a gate. What can I do to establish a direct connexion between the both. (with NT ) (1 Reply)
Discussion started by: hoang
1 Replies

3. Shell Programming and Scripting

modifying my shell

Hello, I have installed a new program called chimera under the directory /usr/local/bin/chimera. the executable is under the directory /usr/local/bin/chimera/bin/chimera.e If i put myself under the latest directiry and I type ./chimera, the program works. I would like to avoid this and I... (1 Reply)
Discussion started by: nico-hellas
1 Replies

4. Shell Programming and Scripting

Modifying file from outside

hi , I have a javascript file like this: function fnValidateId(){ var array_id = new Array("444","7888","6633","555","146562","3333","33332") var tmp_id = document.form1.id.value; var num=0; while(1) { if(tmp_id ==... (9 Replies)
Discussion started by: Sreejith_VK
9 Replies

5. Shell Programming and Scripting

.bashrc files modifying the PS1 variable?

Is there a command for finding all files on the system named ".bashrc" that modify the PS1 variable? I'd like to list the full file name(s) and the protection (including the full path). (5 Replies)
Discussion started by: raidkridley
5 Replies

6. UNIX for Dummies Questions & Answers

Modifying rows

Hi, I have a file that looks something like this (2 columns 4 rows): eeeeeeeeeeeeeeeeeeeeeeeeeeeee -45 rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr -24 ttttttttttttttttttttttttttttttttttttttttttt -29 uuuuuuuuuuuuuuuuuuuuuuuuuuu -23 How do I get it to look like this: -45... (3 Replies)
Discussion started by: phil_heath
3 Replies

7. Shell Programming and Scripting

Help with modifying files

Hello everyone, I have some data files, with mixed header formats. the sample for the same is: >ABCD76567.x1 AGTCGATCGTAGTCGTAGCTGT >ABCD76567.y1 AGTCGATCGTAGTCGTAGCTGT >ABCD76568.x1 pair_info:898989 AGTCGATCGTAGTCGTAGCTGT >ABCD76568.y1 pair_info:893489 AGTCGATCGTAGTCGTAGCTGT... (2 Replies)
Discussion started by: ad23
2 Replies

8. Solaris

Setting/Modifying variable specific to target in Makefile

Hi, I have a small piece of Makefile script which throw's error on Sun Sparc machine, but works fine with Sun Optron, Linux, AIX machines. FOO=Naveen test1:FOO=Dhilip test1: @echo FOO is ${FOO} test2: @echo Me is ${FOO} Output on Sun Sparc - ukhml-v890new-~/test: make test1... (5 Replies)
Discussion started by: nsriram
5 Replies

9. Shell Programming and Scripting

Need some help modifying script

I have a script that currently runs fine and I need to add or || (or) condition to the if statement and I'm not sure the exact syntax as it relates to the use of brackets. my current script starts like this: errLog="/usr/local/website-logs/error.log" apacheRestart="service httpd restart"... (3 Replies)
Discussion started by: jjj0923
3 Replies

10. Shell Programming and Scripting

Help with modifying a filename

Hello, I have a filename that looks like this: ABC_96_20141031_041133.232468 I need to shorten only the "_2014" part of the filename to simply "_14" so the filename looks like: ABC_96_141031_041133.232468 I have to do a search for this string because there are hundreds of files and... (17 Replies)
Discussion started by: bbbngowc
17 Replies

LEARN ABOUT DEBIAN

struct::compare

Compare(3pm)						User Contributed Perl Documentation					      Compare(3pm)

NAME

       Struct::Compare - Recursive diff for perl structures.

SYNOPSIS

	   use Struct::Compare;
	   my $is_different = compare($ref1, $ref2);

DESCRIPTION

       Compares two values of any type and structure and returns true if they are the same. It does a deep comparison of the structures, so a hash
       of a hash of a whatever will be compared correctly.

       This is especially useful for writing unit tests for your modules!

PUBLIC FUNCTIONS

       o   $bool = compare($var1, $var2)

	   Recursively compares $var1 to $var2, returning false if either structure is different than the other at any point. If both are
	   undefined, it returns true as well, because that is considered equal.

BUGS
/NEEDED ENHANCEMENTS
       o   blessed references

	   compare currently does not deal with blessed references. I need to look into how to deal with this.

LICENSE

       (The MIT License)

       Copyright (c) 2001 Ryan Davis, Zen Spider Software

       Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the
       "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish,
       distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to
       the following conditions:

       The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

       THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
       MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
       CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
       SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

AUTHOR

       Ryan Davis <ryand-cmp@zenspider.com> Zen Spider Software <http://www.zenspider.com/ZSS/>

perl v5.12.4							    2011-07-04							      Compare(3pm)
All times are GMT -4. The time now is 11:38 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy