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sed across multiple files
Post 13510 by Kelam_Magnus on Friday 18th of January 2002 09:24:30 AM
01-18-2002
tweak script
I have a minor change to your script. Which will do the job.
Make a file with the listing of the files you want to change. This might be necessary if the directory your 40 files are in has other files that you don't want to change in it.
Make a file with only the filenames of your 40 files in it. Then do the script this way. (with backtics)
for x in `cat filename`
do
sed "s/, LA/,LA/g" $x > temp
cat temp > $x
rm temp
done
By default the 'sed' command will output all lines, even the ones it doesn't modify. If you did only want the lines that you modified to be output use this option 'sed -n ....'. This will suppress all lines that weren't modified.
Now that I think about it, you really don't need the 'rm temp' because your line, "sed "s/, LA/,LA/g" $x > temp", has only the '>' which will overwrite the temp file each time you come thru the 'for loop'.
So this will work as well.
for x in `cat filename`
do
sed "s/, LA/,LA/g" $x > temp
cat temp > $x
done
Make a file with the listing of the files you want to change. This might be necessary if the directory your 40 files are in has other files that you don't want to change in it.
Make a file with only the filenames of your 40 files in it. Then do the script this way. (with backtics)
for x in `cat filename`
do
sed "s/, LA/,LA/g" $x > temp
cat temp > $x
rm temp
done
By default the 'sed' command will output all lines, even the ones it doesn't modify. If you did only want the lines that you modified to be output use this option 'sed -n ....'. This will suppress all lines that weren't modified.
Now that I think about it, you really don't need the 'rm temp' because your line, "sed "s/, LA/,LA/g" $x > temp", has only the '>' which will overwrite the temp file each time you come thru the 'for loop'.
So this will work as well.
for x in `cat filename`
do
sed "s/, LA/,LA/g" $x > temp
cat temp > $x
done
This User Gave Thanks to Kelam_Magnus For This Post:
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LEARN ABOUT DEBIAN
subst
SUBST(1) General Commands Manual SUBST(1) NAME
subst - substitute definitions into file(s) SYNOPSIS
subst [ -e editor ] -f substitutions victim ... DESCRIPTION
Subst makes substitutions into files, in a way that is suitable for customizing software to local conditions. Each victim file is altered according to the contents of the substitutions file. The substitutions file contains one line per substitution. A line consists of two fields separated by one or more tabs. The first field is the name of the substitution, the second is the value. Neither should contain the character `#', and use of text-editor metacharacters like `&' and `' is also unwise; the name in particular is best restricted to be alphanumeric. A line starting with `#' is a comment and is ignored. In the victims, each line on which a substitution is to be made (a target line) must be preceded by a prototype line. The prototype line should be delimited in such a way that it will be taken as a comment by whatever program processes the file later. The prototype line must contain a ``prototype'' of the target line bracketed by `=()<' and `>()='; everything else on the prototype line is ignored. Subst extracts the prototype, changes all instances of substitution names bracketed by `@<' and `>@' to their values, and then replaces the tar- get line with the result. OPTIONS
-e Substitutions are done using the sed(1) editor, which must be found in either the /bin or /usr/bin directories. To specify a dif- ferent executable, use the ``-e'' flag. EXAMPLE
If the substitutions file is FIRST 111 SECOND 222 and the victim file is x = 2; /* =()<y = @<FIRST>@ + @<SECOND>@;>()= */ y = 88 + 99; z = 5; then ``subst -f substitutions victim'' changes victim to: x = 2; /* =()<y = @<FIRST>@ + @<SECOND>@;>()= */ y = 111 + 222; z = 5; FILES
victimdir/substtmp.new new version being built victimdir/substtmp.old old version during renaming SEE ALSO
sed(1) DIAGNOSTICS
Complains and halts if it is unable to create its temporary files or if they already exist. HISTORY
Written at U of Toronto by Henry Spencer. Rich $alz added the ``-e'' flag July, 1991. BUGS
When creating a file to be substed, it's easy to forget to insert a dummy target line after a prototype line; if you forget, subst ends up deleting whichever line did in fact follow the prototype line. 25 Feb 1990 SUBST(1)