How to delete from a text file, all lines that contain a specific string?

There are many other ways to delete lines with specific string besides sed:

awk '!/pattern/' file > temp && mv temp file

ruby -i.bak -ne 'print if not /test/' file

perl -ni.bak -e "print unless /pattern/" file

while read -r line
do
  [[ ! $line =~ pattern ]] && echo "$line"
done <file > o
mv o file

grep -v "pattern" file > temp && mv temp file

And of course sed (printing the inverse is faster than actual deletion):

sed -n '/pattern/!p' file

To remove the line and print the output to standard out:

sed '/pattern to match/d' ./infile

To directly modify the file – does not work with BSD sed:

sed -i '/pattern to match/d' ./infile

Same, but for BSD sed (Mac OS X and FreeBSD) – does not work with GNU sed:

sed -i '' '/pattern to match/d' ./infile

To directly modify the file (and create a backup) – works with BSD and GNU sed:

sed -i.bak '/pattern to match/d' ./infile

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