This script also demonstrate how to use arrays under bash shell script.
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 | #!/bin/bash # Bash shell script to reverse text file contain i.e. concatenate files and # print on the standard output in reverse. This script also demonstrate how # to use arrays under bash shell script. # ------------------------------------------------------------------------- # Copyright (c) 2005 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" if [ $# -eq 0 ]; then echo "$(basename $0) - file-name" exit 1 fi textArray[0]="" # hold text c=0 # counter # read whole file in loop while read line do textArray[$c]=$line # store line c=$(expr $c + 1) # increase counter by 1 done < $FILE # get length of array len=$(expr $c - 1 ) # use for loop to reverse the array for (( i=$len; i>=0; i-- )); do echo ${textArray[$i]} done |
Thanks…………….. But i want this program using switch case
tac $File | rev
reverses output of everything, simple, both tac and rev in coreutils
It just reverses the ordering of the file lines. It does not reverse the actual text.
can’t you just do a
tac filename.txt > filename-reversed.txt
zakko,
Thanks for the heads up.
textArray[c]=$line # store line
isn’t it
textArray[$c]=$line # store line
^
|
ERROR