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Full Discussion: How to replace string in variable?
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
Old 03-19-2019
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
 

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LEARN ABOUT SUNOS

break

break(1)							   User Commands							  break(1)

NAME

       break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until	loop

SYNOPSIS

   sh
       break [n]

       continue [n]

   csh
       break

       continue

   ksh
       *break [n]

       *continue [n]

DESCRIPTION

   sh
       The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels.

       The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop.

   csh
       The  break  utility  resumes  execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current
       line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line.

       The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop.

   ksh
       The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified,	then  break  n	levels.  If  n	is
       greater than the number of enclosing loops, the outermost enclosing loop shall be exited.

       The  continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n-
       th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a  vari-
	   able  assignment.  This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera-
	   tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), exit(1), ksh(1), sh( 1), attributes(5)

SunOS 5.10							    17 Jul 2002 							  break(1)
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