Linux Commands

I am updating this post when I find a useful linux command. And keep this post, just for my reference and for anyone who may find it helpful.

1. Clear | Truncate the data in a file without opening.

   truncate -s 0 <file name>

2. Find files which has given text in given location

   grep -nrwl  -e <"text to find">

   n: line number
   r : recursive
   w: match the whole word, if search for a part of the word omit w
   l : show the file only

3. Create folder tree

   mkdir -p level_1/{level_2_a,level_2_b}

4. Find and delete file | folder

    find . -name ".project" -exec rm -r "{}" \;

5. List all the files which are edited in the given date range

    find repository/conf/ -type f -name "*.xml" -newermt 2015-05-11 ! -newermt 2015-06-07

6. Print the last n number of lines of a file.

   tail -n file_name

7. Find and replace the text of all the files recursively in given location.

   grep --include={*.java,*.xml} -rnl './' -e "find-text" | xargs -i@ sed -i 's/find-text/replace-text/g' @