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| Shell Scripts |
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Shell scripts are nothing but a set of commands held in a flat file, and the file can be run as a program by invoking it. A script file allows you to put the commands in a file, called a shell script, and then execute the file. A shell script is much like a batch file: It is a list of UNIX commands typed in a file, and then the file is executed. More sophisticated scripts contain programming constructs for making decision's, looping, file testing, and so forth.
Sample Shell Scripts
1. User Defined Menu
#!/bin/ksh
# This Product is Designed and Developed by Deepak Chebbi
# The purpose of the script is to illustrate the use of case statement
# The script pops us a menu, with two options 1 and Q
# If the user chooses any other option He/She gets and error message
# The UI allows users to choose from the two presented options
# The script can be tailored to meet your needs – all additional options if required
# You can use /n or /t combinations with the echo command to provide
# Better Indentation
while ( true )
do
echo "\n\n\t\tMy First Program"
echo "\n\t\t1 ->Welcome"
echo "\n\t\tq -> QUIT"
echo "\n\n\t\tTo select any of the options, enter the number or Q to Quit"
echo "\n\n\t\tEnter your choice :\c "
read option
case $option in
1) echo "Welcome to www.YouSigma.com"
;;
'q'|'Q') exit 0
;;
*) echo "Invalid option."
echo "Hit return for the menu ...\c"
line
;;
esac
done
2. Checking Existence of a file in a Directory
#!/bin/ksh
# This Product is Designed and Developed by Deepak Chebbi
# The purpose of the script is to illustrate the use of "if" statement
# The script checks in the directory assigned to the variable LOCALDIR
# If it finds the file ".profile", the appropriate message is displayed
# The script can be tailored to meet your needs
# Replace the text and/or variable defined in < > to meet your requirements
LOCALDIR=</home/Deepak>
if [ -f ${LOCALDIR}/.profile ]; then
echo ".profile exists"
exit 0
else
echo ".profile Does Not exists"
exit 0
fi
3. Print File Name
#!/bin/ksh
# This Product is Designed and Developed by Deepak Chebbi
# The purpose of the script is to illustrate the use of "for" statement
# The script checks in the directory assigned to the variable LOCALDIR
# for every file it finds in the directory, it displays the file name
# The script can be tailored to meet your needs
# Replace the text and/or variable defined in < > to meet your requirements
LOCALDIR=</home/Deepak>
for file in `ls -lrt ${LOCALDIR} | awk {'print $9'}`
do
echo ${file}
done
4. FTP a File to a Remote Server
#!/bin/ksh
# This Product is Designed and Developed by Deepak Chebbi
# The purpose of the script is to illustrate the use of FTP
# This script will help you to ftp a file “a.out” to a server 100.0.000.00
# The script can be tailored to meet your needs
# Replace the text and/or variable defined in < > to meet your requirements
ftp -nvd <100.0.000.00> <<-END
user <username> <password>
ascii
lcd <LOCAL_CURRENT_DIRECTORY>
cd <CURRENT_DIRECTORY>
put <a.out>
bye
END
5. Strip Special Characters from a File
#!/bin/ksh
#
# This Product is Designed and Developed by
#
# Deepak Chebbi
#
# The purpose of the script is to Strip Special Character ^M from a file called abc.txt
# The outputfile is written with a date stamp as a suffix
# The script can be tailored to meet your needs
#
# Replace the variables and/or text defined in < > to meet your requirements
export INPUT_DIRECTORY=</usr/Deepak>
export OUTPUT_DIRECTORY=</usr/Deepak>
if [ -f ${INPUT_DIRECTORY}/abc.txt ]; then
OUTPUT_FILE=`date '+%y%m%d'`.txt
sed 's/^M//g' ${INPUT_DIRECTORY}/abc.txt | tee ${OUTPUT_DIRECTORY}/${OUTPUT_FILE}
exit 0
fi
6. Cleanup old File
#!/bin/ksh
# This Product is Designed and Developed by
#
# Deepak Chebbi
#
# The purpose of the script is to Clean up old file Beyond a particular day
# In this case 10 days older
# The script can be tailored to meet your needs
# You can use /n or /t combinations with the echo command to provide
# Replace the variables and/or text defined in < > to meet your requirements
export DIRECTORY_NAME=<DIRECTORY_NAME>
find ${DIRECTORY_NAME} -name "*.trc" -ctime +10 -mtime +10 -exec rm -f {} \; 2>/dev/null
7. Backup Files
#!/bin/sh
#
# Purpose: Create backup files and store them in a backup directory
#
# Replace the variables and/or text defined in < > to meet your requirements
dir=</home/deepak/backupscripts>
for file in memo[1-5]
do
if [ -f $file ]
then
cp $file $dir/$file.bak
echo "$file is backed up in $dir"
fi
done
8. Welcome Script
#!/bin/sh
# Echo a Greeting when user logs on
#
echo "Hello $LOGNAME, it's nice talking to you."
echo "Your present working directory is 'pwd'."
echo "You are working on a machine called 'uname -n'."
echo "Here is a list of your files."
ls # list files in the present working directory
echo "Bye for now $LOGNAME. The time is 'date +%T'!"
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