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Full Discussion: Using sed to edit multiple files
Top Forums Shell Programming and Scripting Using sed to edit multiple files Post 303028321 by bakunin on Friday 4th of January 2019 10:52:31 AM
Old 01-04-2019
Quote:
Originally Posted by edstevens
Created a shell script to invoke sed to edit multiple files, but am missing something.
Here's the shell script:
Code:
oracle:$ cat edit_scripts.sh
#!/bin/sh
#------------------------------------------------------------------------------
# edit_scripts.sh
#
# This script executes sed to make global edits to the template files
#------------------------------------------------------------------------------
for i in *.sh; do
  sed -f script.sed < $i
done
#
for i in *.sql; do
  sed -f script.sed < $i
done

The problem is in this line:

Code:
sed -f script.sed < $i

First, sed doesn't need a redirection because it can work on files. Notice that i quoted "$i" because otherwise files with blanks in their names would break your script. It is generally a good idea to religiously quote whatever is quotable in shell scripts - it just comes with the impulse to convert the infidels, like i am doing to you right now. ;-)

Code:
sed -f script.sed  "$i"

Second, sed puts it output to <stdout> as per default. Probably it did do the changes but they were shown on your screen, not your file. To make the changes lasting you need to redirect this output into a (new!) file and only then move that file over the old one. As an additional measure of caution only do so if sed returned 0. This guards against i.e. disk-full-conditions where the output cannot be written (fully) to the disk and you move then a corrupt script over a perfectly fine template:

Code:
if sed -f script.sed  "$i" > "$i".tmp ; then
     mv "$i".tmp "$i"
fi

I hope this helps.

bakunin
 

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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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