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Full Discussion: Problem with sed in for loop, would appreciate some help
Top Forums UNIX for Beginners Questions & Answers Problem with sed in for loop, would appreciate some help Post 303041832 by andrevol on Wednesday 4th of December 2019 09:01:55 PM
Old 12-04-2019
Problem with sed in for loop, would appreciate some help
Dear expert users,

I am having trouble with this for loop, where I am editing a design file, replacing the subject, session and another parameter in the template design file.

When implementing the for loop, it did not do what I wanted it to, for example editing to {2014}/CAT_Run0[5] instead of my hoped-for 2014/CAT_Run05.

When I tried to run it line by line, replacing the first parameter (using $subj) worked fine (2013 -> 2014), but I got an error on the second (using $run), to me mysterious:
sed: -i may not be used with stdin

Code:
for subj in `cat subjlist.txt`
cd $subj
for run in `cat stimruns.txt`; do
		cd CAT_Run0$run.ica
		block=`cat block.txt`
		cp /Users/template.fsf .	
		sed -i '' "s|2013|$subj|g" template.fsf
		sed -i '' "s|CAT_Run01.ica|CAT_Run0{$run}.ica|g" template.fsf
		sed -i '' "s|Block_5|Block_{$block}|g" template.fsf
done
cd ..
done

Any clues here would be highly appreciated.
Last edited by rbatte1; 12-05-2019 at 09:31 AM.. Reason: Added ICODE tags
 

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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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