Bash snippets for Visual Code
Prefix: 1
Render: >/dev/null
Prefix: 2
Render: 2>/dev/null
Prefix: 12
Render:>/dev/null 2>&1
Prefix: e2
Render: >&2
Prefix: cat
Render:
cat <<-EOF >/path/to/file
EOF
-
The
-option to mark a here document limit string (<<-EOF) suppresses leading tabs (but not spaces) in the output. This may be useful in making a script more readable. -
cat something to
stdoutby removing the redirection to file (>/path/to/file).
See http:https://tldp.org/LDP/abs/html/here-docs.html
Prefix: ite
Render: [[ condition ]] && echo "true" || echo "false" >&2
- Be sure the first command (
echo "true") always exits with 0 otherwise, the second command will also be executed!
Example:
$ [[ 1 -eq 1 ]] && { echo "it's true"; false; } || echo "but it's also false" >&2
it's true
but it's also false
Prefix: while read file
Render:
while read -r line
do
${2:echo "\$line"}
done < ${1:/path/to/file}
Prefix: getopts
Render:
while getopts :?h arg
do
case $arg in
)
: #statements
;;
:|?|h)
[[ $arg == \? ]] && print_error "L'arg -$OPTARG n'est pas prise en charge !"
[[ $arg == : ]] && print_error "L'arg -$OPTARG requiert un argument !"
usage
exit $([[ $arg == h ]] && echo 0 || echo 2)
;;
esac
done
- After triggering this snippet, you must enter a letter (or number) for the first argument, otherwise, script doesn't works.
print_erroris a custom function according to my needs to print message in red to stderr. You can replace it withecho "the error message" >&2.
Same as above but with support of long options.
Prefix: getopts long
Render:
while getopts :?a-:fqvh arg
do
case $arg in
-)
if [[ ${!OPTIND} == -* ]]
then
value=
else
value="${!OPTIND}"
((OPTIND++))
fi
case $OPTARG in
host)
HOST=$value
;;
port)
if [[ ! $value =~ ^[0-9]+$ ]]
then
print_error "L'arg --$OPTARG a besoin d'un entier en parametre. "$value" n'est pas un entier."
usage
exit 2
fi
;;
*)
print_error "Le parametre '--$OPTARG' n'est pas reconnu !"
usage
exit 2
;;
esac
;;
a)
[[ $OPTARG == -* ]] && print_error "L'option -$arg requiert un argument !" && usage && exit 2
;;
)
: #statements
;;
f)
FORCE=1
;;
q)
QUIET=1
;;
v)
VERBOSE=1
;;
:|?|h)
[[ $arg == \? ]] && print_error "L'option -$OPTARG n'est pas prise en charge !"
[[ $arg == : ]] && print_error "L'option -$OPTARG requiert un argument !"
usage
exit $([[ $arg == h ]] && echo 0 || echo 2)
;;
esac
done
See http:https://tldp.org/LDP/abs/html/internal.html#EX33
Prefix: function! Render:
# TODO 's description
# @param The first parameter
# @return
#
function_name() {
local param_name="$1"; shift
echo "TODO !"
}
Prefix: usage Render:
usage() {
cat <<-EOF
Usage: pgihadmin tache <CIBLE> [-f] [-q] [-h]
Cette tache permet de bla bla
PARAMETRES:
===========
CIBLE Serveur cible : <vide> ou all, aps, ts, lb, ord, apsN, tsN, lbN, ordN (avec N un nombre)
OPTIONS:
========
-f Mode force
-q Mode silencieux
-h Affiche ce message
EOF
}