Some basic Linux scripts

Sample Shell Script

Here is what you need to put in a shell script:

#!/bin/bash
# script to send simple email
# email subject
SUBJECT="SET-EMAIL-SUBJECT"
# Email To ?
EMAIL="admin@somewhere.com"
# Email text/message
EMAILMESSAGE="/tmp/emailmessage.txt"
echo "This is an email message test"> $EMAILMESSAGE
echo "This is email text" >>$EMAILMESSAGE
# send an email using /bin/mail
/bin/mail -s "$SUBJECT" "$EMAIL" < $EMAILMESSAGE

Ref: http://theos.in/shell-scripting/send-mail-bash-script/

Change sender's email address  

Use the following:

mail -s "subject" mail1@server.com -- -r "from@fromserver.com" -f </path/to/file>

Ref: http://www.linuxquestions.org/questions/linux-newbie-8/option-to-specify-senders-address-in-mail-command-374223/

Change the lines

this command: echo “first line \nsecond line” will result in the below line:
first line \nsecond line (as you can see there is no new line)
but this one: echo -e “first line \nsecond line” (with the -e) will result in what you want:
echo -e “first line \nsecond line”
first line
second line

http://techteam.wordpress.com/2008/09/25/n-not-creating-new-line-in-bash-script/

String contain test

string='My string';
if [[ $string =~ .*My.* ]]
then
   echo "It's there!"
fi

Ref: http://stackoverflow.com/questions/229551/string-contains-in-bash