How to replace string in variable? Post: 303032491

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Top Forums Shell Programming and Scripting How to replace string in variable? Post 303032491 by baris35 on Tuesday 19th of March 2019 11:07:48 AM

03-19-2019

Registered User

How to replace string in variable?

Hello,
I have simple while and for loops in a shell script and I would like to replace some characters in COL2 when I run it. I am on ubuntu 14.04

Code:

while read COL1 COL2 COL3 COL4
do
name=$COL2
#cat $name | sed -i "s|_| |g" $name
for i in $COL3 $COL4
do
some codes ...... run $i  b="$name"
done
done<list.txt

list.txt

Code:

AA MICHIGAN:_USA_3    http://xx.yy.zz
BB LONDON:_UK_25      http://aa.bb.cc
CC TEXAS:_USA_83         http://11.22.33.44

column2 in list.txt:

Code:

MICHIGAN:_USA_3
LONDON:_UK_25
TEXAS:_USA_83

list.txt file is tab seperated and column 2 contains special characters.
As file is common in use with some other scripts, to change the original list.txt file is not a good idea.
How may I change variable in such a case?

Thanks
Boris

--- Post updated at 10:07 AM ---

Hello,
Sorted out now.

Code:

while read COL1 COL2 COL3 COL4
do
name2=$COL2
echo $name2 | sed "s|_| |g" - > variable
name=$(cat variable)
for i in $COL3 $COL4
do
some codes ...... run $i  b="$name"
done
done<list.txt

Thank you
Boris

Last edited by baris35; 03-19-2019 at 12:11 PM.. Reason: cat fixed

baris35

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LEARN ABOUT LINUX

bzexe

BZEXE(1)						      General Commands Manual							  BZEXE(1)

NAME

       bzexe - compress executable files in place

SYNOPSIS

       bzexe [ name ...  ]

DESCRIPTION

       The  bzexe  utility  allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a
       penalty in performance).  For example if you execute ``bzexe /bin/cat'' it will create the following two files:
	   -r-xr-xr-x  1 root  bin   9644 Feb 11 11:16 /bin/cat
	   -r-xr-xr-x  1 bin   bin  24576 Nov 23 13:21 /bin/cat~
       /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file.  You can remove /bin/cat~ once  you  are	sure  that
       /bin/cat works properly.

       This utility is most useful on systems with very small disks.

OPTIONS

       -d     Decompress the given executables instead of compressing them.

SEE ALSO

       bzip2(1), znew(1), zmore(1), zcmp(1), zforce(1)

CAVEATS

       The  compressed	executable  is a shell script. This may create some security holes. In particular, the compressed executable relies on the
       PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep).

BUGS

       bzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually  in  some  cases,
       using chmod or chown.

																	  BZEXE(1)

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