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Full Discussion: substitution to mulitple files
Top Forums Shell Programming and Scripting substitution to mulitple files Post 302713513 by Don Cragun on Wednesday 10th of October 2012 11:03:50 PM
Old 10-11-2012
When I created the following three files:
f1:
Code:
cat calico
dog dachsund

f2:
Code:
cat tabby
dog collie

f3:
Code:
cat siamese
dog retriever

and stored the following in a file named [icode]tester[icode]:
Code:
#!/bin/ksh
set -xv
PAT=$1
shift
REPL=$1
shift

for FILE in $*
do
        mv $FILE $FILE.bak
        sed "s/$PAT/$REPL/g" $FILE.bak > $FILE
done

and made tester executable by:
Code:
chmod +x tester

and executed it with the command line:
Code:
tester cat kitty f?

the tracing provided clearly shows that cat appears in the sed search field and kitty appears in the sed replacement field while editting f1, f2, and f3. All of the original files are preserved with the .bak extension and all of the original file names now contain kitty instead of cat.

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LEARN ABOUT REDHAT

cat

CAT(1)									FSF								    CAT(1)

NAME

       cat - concatenate files and print on the standard output

SYNOPSIS

       cat [OPTION] [FILE]...

DESCRIPTION

       Concatenate FILE(s), or standard input, to standard output.

       -A, --show-all
	      equivalent to -vET

       -b, --number-nonblank
	      number nonblank output lines

       -e     equivalent to -vE

       -E, --show-ends
	      display $ at end of each line

       -n, --number
	      number all output lines

       -s, --squeeze-blank
	      never more than one single blank line

       -t     equivalent to -vT

       -T, --show-tabs
	      display TAB characters as ^I

       -u     (ignored)

       -v, --show-nonprinting
	      use ^ and M- notation, except for LFD and TAB

       --help display this help and exit

       --version
	      output version information and exit

       With no FILE, or when FILE is -, read standard input.

AUTHOR

       Written by Torbjorn Granlund and Richard M. Stallman.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The full documentation for cat is maintained as a Texinfo manual.  If the info and cat programs are properly installed at  your	site,  the
       command

	      info cat

       should give you access to the complete manual.

cat (coreutils) 4.5.3						   February 2003							    CAT(1)
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