Login or Register to Ask a Question and Join Our Community


Red Hat

how to use env variables within ed

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Operating Systems Linux Red Hat how to use env variables within ed
# 1  
Old 08-17-2011
how to use env variables within ed
i have a file that i need to edit and replace a single value with another. so i have two variables, $oldvalue and $newvalue but below doesn't work:

Code:
ed file.txt << EOF
,s/$oldversion/$newversion/g
wq
EOF

i presume it's the $ that is the issue since it's actually special to ed. any suggestions? thanx in advance.
# 2  
Old 08-17-2011
What characters are special to ed doesn't matter. The shell always substitutes before you run a program, the program shouldn't know or care.

When in doubt, substitute cat to check the pattern:

Code:
$ oldversion=32
$ newversion=64
$ cat <<EOF
,s/$oldversion/$newversion/g
wq
EOF

Code:
,s/32/64/g
wq

Seems okay to me, but yours may be slightly different, maybe your vars aren't what you thought they were, so try it Smilie
Last edited by Corona688; 08-17-2011 at 12:52 PM..
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Setting ENV variables in PERL

I have perl script and in the first line we are invoking .sh script to set ENV variables. e..g eval '. $envfile; exec $PERL -S $0 "$@"' I want to change some of the env variables while the program is running and I am settging it like this .. $ENV{ORACLE_HOME}=trim($oraclehome);... (1 Reply)
Discussion started by: talashil
1 Replies

2. Shell Programming and Scripting

Env variables in script

Hi All, I have script and it's hardcoded the script ca invoke in user home dir and logs will be redirected to home dir of user. how to make the same script will be invoke from /usr/bin with out chg the logs and other functions path from /user/homedir . code is below: pls check how to... (1 Reply)
Discussion started by: saku
1 Replies

3. Solaris

env variables again

What is the difference between ${variable} and $variable when used in a script? (2 Replies)
Discussion started by: orange47
2 Replies

4. UNIX for Dummies Questions & Answers

How to update env variables.

I am newbie on Unix system and seek help for updating env variables. The condition is like this: On Unix server, I log in as oracle user (this is the super for database on Unix), I type > env all envirnment variables show up. I saw one variable DBA_LIST contains a few email addreses. I need... (2 Replies)
Discussion started by: duke0001
2 Replies

5. UNIX for Dummies Questions & Answers

Setting env variables using script

Hi, I wrote two small scripts to set env variables in a shell. java_env.csh #!/bin/csh -fn setenv JAVA_HOME '/scratch/software/jdk1.5.0_11' setenv PATH $PATH':'$JAVA_HOME'/bin' and run it using csh ./java_env.csh But the env variables are not set. I tried running each line on the... (5 Replies)
Discussion started by: NoviceAmod
5 Replies

6. UNIX for Dummies Questions & Answers

set env variables in a new xterm

Hi, I have a script that sets some env variables. I want to source the script in a new xterm and after the script execution is over, the xterm has to be alive with the env variables set according to the script. I tried xterm -e "source ./myscript;tcsh" & The variables are getting set... (3 Replies)
Discussion started by: chaitubek
3 Replies

7. Shell Programming and Scripting

Getting the value of env variables

Hi, I want to get the value of the env varables using the ksh script. All the env variables are stored in a file. Eg. file1 $INPATH $OUTPATH myscirpt: for name in `awk { print $1 } file1` do cd $name done i'm getting the error like $INPATH not found. in the same script... (1 Reply)
Discussion started by: vij_krr
1 Replies

8. UNIX for Dummies Questions & Answers

Env variables not getting updated from the bashprofile

Hi, I am using the HP-UX machine of version B.11.23. My bashprofile looks like this : # @(#)B11.23_LR # Default user .profile file (/usr/bin/sh initialization). #! /usr/bin/bash # Set up the terminal: if then eval ` tset -s -Q -m ':?hp' ` else eval ` tset -s -Q ` fi stty erase "^H"... (0 Replies)
Discussion started by: swethuanju
0 Replies

9. UNIX for Advanced & Expert Users

Ksh - Env. Variables ??

Hey all, I have been using Ksh and in that I am setting Environment variables. To set Env. Variables I have created my own file "BuildScript.sh" in which i have written : export CLASSPATH=/somedir/some other dir/file:. export PATH=/some dir/file:. But when i am calling this... (4 Replies)
Discussion started by: varungupta
4 Replies

10. Shell Programming and Scripting

export env variables

hi i want to write a shell script to set environment variables . But i am not been able to set that for the current shell instead i have to spawn a new shell. Is there a way to set the env variable for the current shell using shell script in bash shell ? Thnx (2 Replies)
Discussion started by: varun.81
2 Replies
Login or Register to Ask a Question