1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | #!/bin/bash # Write a shell script that, given a file name as the argument will write # the even numbered line to a file with name evenfile and odd numbered lines # in a text file called oddfile. # ------------------------------------------------------------------------- # Copyright (c) 2001 nixCraft project <http://cyberciti.biz/fb/> # This script is licensed under GNU GPL version 2.0 or above # ------------------------------------------------------------------------- # This script is part of nixCraft shell script collection (NSSC) # Visit http://bash.cyberciti.biz/ for more information. # ------------------------------------------------------------------------- file=$1 counter=0 eout="evenfile.$$" # even file name oout="oddfile.$$" # odd file name if [ $# -eq 0 ] then echo "$(basename $0) file" exit 1 fi if [ ! -f $file ] then echo "$file not a file" exit 2 fi while read line do # find out odd or even line number isEvenNo=$( expr $counter % 2 ) if [ $isEvenNo -ne 0 ] then # even match echo $line >> $eout else # odd match echo $line >> $oout fi # increase counter by 1 (( counter ++ )) done < $file echo "Even file - $eout" echo "Odd file - $oout" |
Skip to content 
nixCraft
Bash Shell Scripting Directory
nixCraft
Bash Shell Scripting Directory
2 comment
awk ‘NR % 2 {print > “odd”} ! (NR % 2) {print > “even”}’ inputfile
This will split input file into files “even” and “odd”
Or is this more about bash than invoking utilities? And what utilities are allowed then?
/usr/bin/[ is not a builtin…
ODDRE="^ [0-9]*[13579]"
cat -n $1 | grep "$ODDRE" | cut -b 8- > oddfile.$$
cat -n $1 | grep -v "$ODDRE" | cut -b 8- > evenfile.$$