Simple stop

echo "Press enter to continue"; read noing

Colorize cat output of source files

$ pip install Pygments

http://pygments.org/

with pygmentize -g filename

Yes no answer

testFile=/home/patrick/dev/master.properties
sampleService='iris-cms-metadata-management-service'
if [ ! -f $testFile ]; then
  tput setaf 2
  echo "test properties file $testFile is missing"
  tput sgr0else  tput setaf 1;
  echo "Will delete all data from the CMS db.";
  tput sgr0  ;
  read -r -p "Are you sure? [y/N] " response
  case $response in      [yY][eE][sS]|[yY])
    cd $sampleService;
    gradle dropDatabase -Parchaius.url=file:$testFile ;
    cd -;
    ;;
    *)
    echo "OK, no harm done";
    ;;
  esac
fi

Argument parsing

vflag=off
filename=
while getopts vf: opt
do
    case "$opt" in
      v)  vflag=on;;
      f)  filename="$OPTARG";;
      \?)       # unknown flag
          echo >&2 \
      "usage: $0 [-v] [-f filename] [file ...]"
      exit 1;;
    esac
done
shift `expr $OPTIND - 1`

Arrays

distro=("redhat" "debian" "gentoo")
echo ${distro[2]} # will print gentoo
echo ${#distro[@]} # will print array length: 3

Get parent folder from script

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )

Split colon delimited value

From here

### this sets the internal field separator variable
IFS=":"

s='Strings:With:Four:Words'
IFS=":" read -r var1 var2 var3 var4 <<< "$s"
echo "[$var1] [$var2] [$var3 [$var4]"
[Strings] [With] [Four [Words]

Select specific lines with sed

select line 10 up to line 33

sed -n '10,33p' < file.txt

select 1st line and 3rd line

sed -n '1p;3p' < file.txt