Remove file extensions:
bash$ echo $filename | cut -d'.' -f1This will give you everything up until the first period. For the second period, use -f2 as an option, etc.
Renaming the file extension from .asp to .html in the entire directory:
bash$ for f in *.asp; do mv $f `basename $f .asp`.html; done;Renaming the file extension from .asp to .html inside all the files within the director:
bash$ for f in *.html; do sed -f replace.sed -i $f; done;where replace.sed contains:
1,$s:\.asp:.html:gTar a directory into .tar.gz file:
bash$ tar -czvf filename.tar.gz dirnameUntar .tar.gz file:
bash$ tar -xzvf filename.tar.gz -C dir_destinationExit status:
echo helloecho $? # Exit status 0 returned because command executed successfully.lskdf # Unrecognized command.echo $? # Non-zero exit status returned because command failed to execute.echo exit 113 # Will return 113 to shell. # To verify this, type "echo $?" after script terminates.Split a string with delimiter:
#!/bin/bashline=’this “is” a command;this “is” a pattern’COMMAND=${line%;*}PATTERN=${line#*;}echo $COMMANDecho $PATTERNThe output would be:
this “is” a commandthis “is” a patternFind zero length file:
bash$ find <DIR> -type f -size 0 -printRunning remote command using SSH:
bash$ ssh USERNAME@HOSTNAME 'COMMAND'For example, check system status remotely on hostname www.example.com:
bash$ ssh root@www.example.com 'top -b -n 1 | head -n 8'Date and Time format:
bash$ DATE=$(date +"%m-%d-%Y")bash$ TIME=$(date +"%H:%M:%S")bash$ echo ${DATE}_${TIME}11-17-2010_12:15:37Create large file size for testing:
This command will create a 10GB file called testfile.out
bash$ dd if=/dev/zero of=testfile.out bs=1MB count=10000Find zombie process:
bash$ ps -A -ostat,ppid,pid,cmd | grep -e '^[Zz]' Kill zombie process:
bash$ kill -HUP `ps -A -ostat,ppid,pid,cmd | grep -e '^[Zz]' | awk '{print $2}'`Prompt user for input:
echo -ne "\nWould you like to continue (y/n): "read CONTif [ "${CONT}" == "n" ] ; then exit 0;fiRead command line arguments:
bash$ commandline.sh arg1 arg2 arg3$1 = argument 1$2 = argument 2$@ = all arguments$# = number of argumentsMORE TO COME......