Shell Programming and Scripting

#!/bin/ksh
sort -t: -k 1.13,1.13 -k 1.16,1.29 sort.txt > output.txt

#  ls -l  ./sort.sh
# pwd

#!/bin/ksh

# @(#) s1	Demonstrate script file not found.

# Simulate the entering of the script file.
cp sacred-file sort.sh

echo
echo " Sample script file sort.sh:"
cat sort.sh

echo
echo " Sample script file sort.sh, showing invisible characters:"
cat -A sort.sh

echo
echo " Execution of sort.sh:"
./sort.sh

# Change line to simulate coming from Windows / DOS.

echo
echo " Script sort.sh would look like this if from DOS / Windows:"
flip -m sort.sh
cat -A sort.sh

echo
echo " Execution of sort.sh with DOS line endings:"
./sort.sh

echo
echo " And yet it exists and has appropriate permissions:"
ls -lgG sort.sh

exit 0

% ./s1

 Sample script file sort.sh:
#!/bin/ksh

# @(#) s1	Simple test script.

echo " Hello, world."

 Sample script file sort.sh, showing invisible characters:
#!/bin/ksh$
$
# @(#) s1^ISimple test script.$
$
echo " Hello, world."$

 Execution of sort.sh:
 Hello, world.

 Script sort.sh would look like this if from DOS / Windows:
#!/bin/ksh^M$
^M$
# @(#) s1^ISimple test script.^M$
^M$
echo " Hello, world."^M$

 Execution of sort.sh with DOS line endings:
./s1[29]: ./sort.sh: not found [No such file or directory]

 And yet it exists and has appropriate permissions:
-rwxr-xr-x 1 70 Feb  4 09:32 sort.sh