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Full Discussion: 'sed' with Positional Parameters
Top Forums UNIX for Beginners Questions & Answers 'sed' with Positional Parameters Post 303038414 by daryl0505 on Tuesday 3rd of September 2019 02:09:12 AM
Old 09-03-2019
'sed' with Positional Parameters
I'm new with 'sed' and for sure something still I don't understand yet with it. If you see my output on ">Output..." portion, the new directory still on "source_dir" instead of "dest_dir". You may disregard for the "tar" part, this is just a test script, just for me to understand 'sed' using the Positional Parameters ($1 $2 $3..). Could you shed some light for me please? I really appreciate any help.

File contents (*.txt) in source folder (source_dir):
Code:
/home/test/scripts/sed/source_dir/file1/file1.txt
/home/test/scripts/sed/source_dir/file2/file2/file2.txt
/home/test/scripts/sed/source_dir/file3/file3/file3/file3.txt

Objective:
I want to compress all those *.txt files on a new directory "dest_dir" but with their own subdirectories (according to souce folder), like the output below:
Code:
/home/test/scripts/sed/dest_dir/file1/file1.txt
/home/test/scripts/sed/dest_dir/file2/file2/file2.txt
/home/test/scripts/sed/dest_dir/file3/file3/file3/file3.txt

My script:
Code:
#!/bin/sh
input_file_type="txt"

find $1 -name *.$input_file_type | sort | while read in_file
do
        echo ">Input "$in_file

        out_file=$(echo $in_file | sed 's/$1/$2/g')

        echo ">Output "$out_file

        tar -zcvf "$in_file" "$out_file"
done

My Output with the script:
Code:
[test@centoslab sed]$ ./zip_test ~/scripts/sed/source_dir/ ~/scripts/sed/dest_dir/
>Input /home/test/scripts/sed/source_dir/file1/file1.txt
>Output /home/test/scripts/sed/source_dir/file1/file1.txt  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
tar: Removing leading `/' from member names
/home/test/scripts/sed/source_dir/file1/file1.txt
>Input /home/test/scripts/sed/source_dir/file2/file2/file2.txt
>Output /home/test/scripts/sed/source_dir/file2/file2/file2.txt  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
tar: Removing leading `/' from member names
/home/test/scripts/sed/source_dir/file2/file2/file2.txt
>Input /home/test/scripts/sed/source_dir/file3/file3/file3/file3.txt
>Output /home/test/scripts/sed/source_dir/file3/file3/file3/file3.txt  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
tar: Removing leading `/' from member names
/home/test/scripts/sed/source_dir/file3/file3/file3/file3.txt
[test@centoslab sed]$

 

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LEARN ABOUT LINUX

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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