bash collections

check_dir_exist.sh

# check if a directory exists in a shell script you can use the following:

if [ -d "$DIRECTORY" ]; then
  # Control will enter here if $DIRECTORY exists.
fi

#Or to check if a directory doesn't exist:
if [ ! -d "$DIRECTORY" ]; then
  # Control will enter here if $DIRECTORY doesn't exist.
fi

#find the double-bracket version of test makes writing logic tests more natural:
if [[ -d "${DIRECTORY}" && ! -L "${DIRECTORY}" ]] ; then
    echo "It's a bona-fide directory"
fi

check_is_mac_user.sh

# If we are on a mac, lets install and setup homebrew
if [ "$(uname -s)" == "Darwin" ]
then
    info "installing dependencies"
    if . bin/dot > /tmp/dotfiles-dot 2>&1
    then
        success "dependencies installed"
    else
        fail "error installing dependencies"
    fi
fi

loop_files.sh

# loop all file in $HOME and printing each item
for item in $HOME/*; do
    if [ -f "$item" ]; then
        cat "$item"
    fi
done

# print 0 --> 9
num=0
while [ $num -lt 10 ]; do
    echo $num;
    num=$((num + 1)) # <=> `expr $num + 1``
done