bash_programming.sh

bash_programming.sh

# Number comparison: [[ -gt, -ge, -lt, -le ]]
# Number comparison: (( <, <=, >, >= ))

# String comparison: [[ ==, != ]]
# String comparison: -z zero_length_string, -n not_zero_length_string
# String comparison: 
  [[ $a == z* ]]   # True if $a starts with an "z" (pattern matching).
  [[ $a == "z*" ]] # True if $a is equal to z* (literal matching).
  [ $a == z* ]     # File globbing and word splitting take place.
  [ "$a" == "z*" ] # True if $a is equal to z* (literal matching).

# Repeat N times
for N in {1..3}; do
  echo "Repeating $N times."
done
for (( N=0; N<3; N++ )); do
  echo "Repeating $N times."
done

# Check to see if we are in Cygwin env
if [[ $OS == Windows* ]]; then
	echo "We in Windows/cygwin shell."
else
	echo "We are in non Windows/cygwin shell."
fi

# Default N=0, if arguments[0] given, then assign it.
function atest() {
  N=0
  if [[ $# -ge 1 ]]; then
    N=1
  fi
  echo "Parameter N=$N"
}

# Loop through a constant list
LIST="
one
two
three"
for N in $LIST; do
  echo $N
done