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Full Discussion: To remove double quotes from specific columns
Top Forums UNIX for Beginners Questions & Answers To remove double quotes from specific columns Post 303012839 by Don Cragun on Saturday 10th of February 2018 11:04:21 AM
Old 02-10-2018
Quote:
Originally Posted by abdulbadii
Code:
a="event_log_id","event_id","event_name","event_time","insertion_time","event_args","src_mac","src_name","src_util_id","src_device_type","src_event_count","src_admin_state","src_ops_state","src_location_util_id","src_location_type","src_service_pt_util_id","src_service_pt_type","src_addr_line1","src_addr_line2"

i=0
for s in `echo $a |sed 's/,/ /g'`
 do
 let i+=1
 if [ $i -ge 2 ]; then echo -n ,; fi
 if [ $i = 5 -o $i = 6 -o $i = 9 -o $i = 10 -o $i =14 ]
 then
   echo -n $s |sed 's/\"//g'
 else
  echo -n $s
 fi 
done

I don't know why one would want to use the above code instead of other suggestions that have been provided by others in this thread. The request presented in this thread is to process a file in CSV format with one line from a sample file provided to show the desired behavior. Nowhere is it suggested that files to be processed will only contain one line.

Note that there is a syntax error (marked in red above). That portion of the conditional expression would need to be changed to $i = 14 (note the added <space> between the = and the 14) to get rid of the syntax error.

If the syntax error is corrected, the above code (instead of invoking awk once per file or sed once per file assuming that invocation of sed includes five substitution commands) invokes sed five times for each line in each file to be processed. With anything more than a few lines, invoking sed so often would use significantly more system resources and cause a script using this method to run slower than scripts using the other suggestions provided in this thread.
Last edited by Don Cragun; 02-10-2018 at 12:36 PM.. Reason: Update statement on how many times sed is invoked by RudiC's suggestion.
 

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LEARN ABOUT DEBIAN

shtool-subst

SHTOOL-SUBST.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-SUBST.TMP(1)

NAME

       shtool-subst - GNU shtool sed(1) substitution operations

SYNOPSIS

       shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext]
       [-e|--exec cmd] [-f|--file cmd-file] [file] [file ...]

DESCRIPTION

       This command applies one or more sed(1) substitution operations to stdin or any number of files.

OPTIONS

       The following command line options are available.

       -v, --verbose
	   Display some processing information.

       -t, --trace
	   Enable the output of the essential shell commands which are executed.

       -n, --nop
	   No operation mode. Actual execution of the essential shell commands which would be executed is suppressed.

       -w, --warning
	   Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution
	   operations resulted in no content change on all files.

       -q, --quiet
	   Suppress warning on substitution operation resulting in no content change.

       -s, --stealth
	   Stealth operation. Preserve timestamp on file.

       -i, --interactive
	   Enter interactive mode where the user has to approve each operation.

       -b, --backup ext
	   Preserve backup of original file using file name extension ext.  Default is to overwrite the original file.

       -e, --exec cmd
	   Specify sed(1) command directly.

       -f, --file cmd-file
	   Read sed(1) command from file.

EXAMPLE

	#   shell script
	shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch]

	#    RPM spec-file
	%install
	    shtool subst -v -n 
		-e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g' 
		-e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g' 
		`find . -name Makefile -print`
	    make install

HISTORY

       The GNU shtool subst command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 2001 for GNU shtool.  It was prompted
       by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications.

SEE ALSO

       shtool(1), sed(1).

18-Jul-2008							   shtool 2.0.8 					       SHTOOL-SUBST.TMP(1)
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