On Nov 28, 2007 10:26 AM, adrian kok <adriankok2000@xxxxxxxxxxxx> wrote: > Hi > > Please help how insert `who` in the third line of the > file > > "head -n 3 file" << `who` > > Thank you > If you are talking about inserting it in the output on the screen then you could do something like this where file is replaced with the file you are working on. head -n 3 file;who;tail -n $(echo "$(wc -l file | cut -d " " -f 1) -3" |bc) file What I did was use the word count command (wc) to count the number of lines and then used the cut command to grab only the first field in the output of the wc command (being the actual number of lines in the file). I then used the bc command (a calculator) to substract 3 from the total number of lines. Finally the result of that calculation was used in the tail command to display all but the first 3 lines of the file. if you want to insert it in the file itself then one way would be to redirect the head command to a new file, then double redirect the who command to the same file to append to it, then double redirect the tail command to the new file and you are done. So something like this: head -n 3 file >newfile;who>>newfile;tail -n $(echo "$(wc -l file | cut -d " " -f 1) -3" |bc) file>>newfile Jacques B.
