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UNIX for Dummies Questions & Answers
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 PLAN9
join
JOIN(1) General Commands Manual JOIN(1) NAME
join - relational database operator SYNOPSIS
join [ options ] file1 file2 DESCRIPTION
Join forms, on the standard output, a join of the two relations specified by the lines of file1 and file2. If one of the file names is the standard input is used. File1 and file2 must be sorted in increasing ASCII collating sequence on the fields on which they are to be joined, normally the first in each line. There is one line in the output for each pair of lines in file1 and file2 that have identical join fields. The output line normally con- sists of the common field, then the rest of the line from file1, then the rest of the line from file2. Input fields are normally separated spaces or tabs; output fields by space. In this case, multiple separators count as one, and leading separators are discarded. The following options are recognized, with POSIX syntax. -a n In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2. -v n Like -a, omitting output for paired lines. -e s Replace empty output fields by string s. -1 m -2 m Join on the mth field of file1 or file2. -jn m Archaic equivalent for -n m. -ofields Each output line comprises the designated fields. The comma-separated field designators are either 0, meaning the join field, or have the form n.m, where n is a file number and m is a field number. Archaic usage allows separate arguments for field designators. -tc Use character c as the only separator (tab character) on input and output. Every appearance of c in a line is significant. EXAMPLES
sort /adm/users | join -t: -a 1 -e "" - bdays Add birthdays to password information, leaving unknown birthdays empty. The layout of is given in users(6); bdays contains sorted lines like tr : ' ' </adm/users | sort -k 3 3 >temp join -1 3 -2 3 -o 1.1,2.1 temp temp | awk '$1 < $2' Print all pairs of users with identical userids. SOURCE
/sys/src/cmd/join.c SEE ALSO
sort(1), comm(1), awk(1) BUGS
With default field separation, the collating sequence is that of sort -b -ky,y; with -t, the sequence is that of sort -tx -ky,y. One of the files must be randomly accessible. JOIN(1)