Calculate and round numbers up in bash

You can use perl:

$ perl -MPOSIX=ceil -anle '$F[0] = ceil($F[0]/65);print "@F"' file 24 C_P.doc 11 C_M.doc 14 G_S.doc 15 J_Z.doc 24 J_M.doc 27 L_B.doc 

If you don't mind using python in shell and assuming that a.txt is your file:

[sreeraj@server ~]$ cat a.txt 1533 C_P.doc 691 C_M.doc 905 G_S.doc 945 J_Z.doc 1549 J_M.doc 1701 L_B.doc [sreeraj@server ~]$ for i in $(awk -v c=65 '{ print $1/c }' a.txt) ; do python -c 'print int(round('$i',0))' ; done >> b.txt [sreeraj@server ~]$ paste b.txt a.txt > c.txt [sreeraj@server ~]$ cat c.txt 24 1533 C_P.doc 11 691 C_M.doc 14 905 G_S.doc 15 945 J_Z.doc 24 1549 J_M.doc 26 1701 L_B.doc [sreeraj@server ~]$ 

This will create the file c.txt with the desired output.

How it works:

It uses awk to divide the values in the 1st column of a.txt by 65 and then use python's in-built function round() to round the decimals. Then we create a file c.txt with the output from the 'for' loop and use paste to combine the c.txt and a.txt