Search a string in a file and delete it from this file by Shell Script

Question

I want to delete a line containing a specific string from the file  How can I do this without using awk  I tried to use sed but I could not achieve it

User · Answer

sed -i   pattern d  file   Use  d  to delete a line  This works at least with GNU-Sed    If your Sed doesn t have the option  to change a file in place  maybe you can use an intermediate file  to store the modification    sed   pattern d  file  gt  tmpfile  amp  amp  mv tmpfile file   Writing directly to the source usually doesn t work  sed   pattern d  file  gt  file so make a copy before trying out  if you doubt it

User · Answer

Try the vim-way   ex -s   g foo d  -cwq file txt

User · Answer

This should do it   sed -e s deletethis  g -i   sed -e  s deletethis  g  -i backup   sed -e  s deletethis  g  -i  backup     it will replace all occurrences of  deletethis  with     nothing  in all files      editing them in place   In the second form the pattern can be edited a little safer  and it makes backups of any modified files  by suffixing them with   backup    The third form is the way some versions of sed like it   e g  Mac OS X   man sed for more information

[bash] Search a string in a file and delete it from this file by Shell Script

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