Shell script to accept any input and reverses the order

[menha]

Dear All I am trying to create a shell script that accepts any input and reverses the order. I came up with the code as below but however I don't seem to achieve my objective. Please members kindly tell me what problem is with my script


!/bin/sh
#
#
clear

#
#
echo -e "\n\n\nFor Example: Given 1234, I will print 4321.\n\n"

# echo -e "\n\nPlease enter a string of numbers:\n"

# read num
set num=1234
set rev=0
set tmp_num="$num"

while [ $num !=$rev ]
do

RMND=$num %10
rev=$RMND +10*$rev
num=$num / 10
done
echo -e "\nThe reverse of the Number $tmp_num is $rev"

[Gödel]

your shebang on line 1 is missing the #, and you can just use 'rev' to reverse a string

#!/bin/sh
#
clear

#
echo -e "\n\n\nFor Example: Given 1234, I will print 4321.\n\n"

# echo -e "\n\nPlease enter a string of numbers:\n"
# read num
num=1234

echo -ne "\nThe reverse of the Number $num is "
echo "$num" | rev

---------- Post added at 09:39 AM ---------- Previous post was at 09:38 AM ----------

if rev isn't available do 'yum install util-linux-ng'

---------- Post added at 09:42 AM ---------- Previous post was at 09:39 AM ----------

if you really just want pure shell code, see (for example) http://www.unix.com/shell-programmin...ll-script.html

[menha]

Thanks, I'm on it will give you feed back

---------- Post added at 03:39 PM ---------- Previous post was at 03:14 PM ----------

Dear Godel, the code you gave me works pretty fine im grateful.

I however would like to add some more functionality such that I can be able to enter from the keyboard a list of input such as peoples names or figures with 2 decimal places in any order and the order in which they are entered is reversed. For instance i enter 20 30 40 from the keyboard then the out put is 40 30 30 or ABCD EFGH IJKL and the out put is IJKL EFGH ABCD

[Gödel]

well, there are many ways to do it (splitting the string into tokens), something like this should work

#!/bin/sh
#
clear

#
echo -e "\n\n\nFor Example: Given 1234 5678 abcd, I will print 4321 8765 dcba.\n\n"

#echo -e "\n\nPlease enter a string:\n"
#read string
string="1234 5678 abcd"

echo -ne "\nThe reverse of the string $string is "
revstring=""
for i in $(echo $string)
do
  tmpstr=$(echo "$i" | rev)
  revstring="$revstring$tmpstr "
done
echo "$revstring"

[menha]

Thanks again, one of my first serious encounters with shell has been quit an experience. Any Ideas of where I can get material to introduce me to detailed shell scripting from scratch to detailed and Advanced would be appreciated. Thanks again

[Gödel]

maybe have a look at these bash tutorials (bash is the most popular shell in modern linux)

http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html

http://linuxconfig.org/Bash_scripting_Tutorial

http://tldp.org/LDP/abs/html/

---------- Post added at 12:43 PM ---------- Previous post was at 12:38 PM ----------

a slight simplification of the reverse script is

string="1234 5678 abcd"

echo -ne "\nThe reverse of the string $string is "
for i in $(echo $string)
do
echo "$i" | rev | tr '\n' ' '
done
echo