remove a line in files

Shell Programming and Scripting
1

Hi

I have 3 files and I want to remove 1 line in each file. This line correposnds to the occurrence of a specific pattern

any idea how to do this in shell?

thx

2

sounds like 'sed' would be a good starting point.
what have you tried so far?

3

Use search, this solutions has told so many times using grep, sed, awk, perl, shell ex. case, ...
No need to use shell, simple commandline using cmd grep is enough:
ex.
grep -v "removedatapattern" infile > resultfile

4

First make backups of your files.

Does each file have the same pattern? If so,

sed -i '/PATTERN/d' file1 file2 file3

Now this might remove MULTIPLE lines in each file matching the pattern. If that's unacceptable, you can use awk this way:

for m in file1 file2 file3; do
   awk 'fixed && /PATTERN/ { fixed=1; next; } { print }' $m .~$m.$$
   mv .~$m.$$ $m
done

There might be a way to do this in sed too.

5

try:

perl -i -e ' while(<>) { unless (/pattern/) {print; }} ' file1 file2 ...