{{tag>Brouillon Bash Script}} # Script bash fonctions en vrac Voir [[notes_hexa|Fonctions conversion Hexa ASCII]] Fonctions récupérées de http://www.trapkit.de/tools/checksec.sh ~~~bash #! /bin/bash set -euo pipefail IFS=$' \t\n' export LC_ALL=C SCRIPT_NAME=$(basename "$0") readonly SCRIPT_NAME SCRIPT_DIR=$(readlink -m "$(dirname "$0")") readonly SCRIPT_DIR # Launch this script as root if [ $EUID != 0 ]; then sudo "$0" "$@" exit $? fi [ -r /etc/default/plop ] && . /etc/default/plop # check if command exists command_exists() { type $1 > /dev/null 2>&1; } command_exists() { command -v "$1" >/dev/null 2>&1 || ( echo "I require $1 but it's not installed. Aborting." >&2 exit 127 ) } for COMMAND in "nova" "glance" "dmidecode" "tr" do command_exists "${COMMAND}" done exit_si_erreur(){ if [ $1 != 0 ] then echo "Sortie en erreur." exit 1 fi } # plop ; exit_si_erreur $? get_mountpoint() { df -l --output=target "$1" |sed -e "1d" ;} # check if directory is empty dir_is_empty() { if [ -z "$(ls -A $1)" ] then return 0 else return 1 fi } isNonEmptyStr() { echo "$@" | grep -q -v -e "^$" ;} is_empty_var() { local var var=$1 if [[ "${!var:-}" == "" ]] } is_valid_value_var() { # Syntax exemple : # is_valid_value_var BOOL y n && echo "VAR 'BOOL' is 'y' or 'n'" # is_valid_value_var NUM 1 2 3 || echo "VAR 'NUM' is not 1, 2, or 3" local var=$1 shift for value in "$@" do if [ "${!var-}" == "$value" ] then return 0 # TRUE fi done return 1 # FALSE } isDevMounted() { findmnt --source "$1" >/dev/null;} #device only isPathMounted() { findmnt --target "$1" >/dev/null;} #path only isMounted() { findmnt "$1" >/dev/null;} #device or path is_mount() { findmnt -M "$1" >/dev/null ;} # Voir aussi la commande "mountpoint" # check user privileges root_privs() { if [ "$(/usr/bin/id -u)" -eq 0 ] then return 0 else return 1 fi } # Require that this runs as root. [ "$UID" -eq 0 ] || exec sudo "$0" "$@" # check if input is numeric isNumeric() { echo "$@" | grep -q -v -e "[^0-9]" ; } # check if input is a string isString() { echo "$@" | grep -q -v -e "[^A-Za-z]" ; } # check if file exist file_exist() { if [ $# -ne 1 ] then echo "illegal number of parameters" exit 2 fi [ -e "$1" ] } # return_only_files_exists() { ls -1 "$@" 2>/dev/null ;} if !(isString "$2") then printf "\033[31mError: Please provide a valid process name.\033[m\n\n" exit 1 fi if ! command -v zgrep &> /dev/null then zgrep() { zcat "$2" | grep "$1" } fi check_device() { if [ -c "$1" ] then wrap_good "$1" 'present' else wrap_bad "$1" 'missing' EXITCODE=1 fi } strip_comment() { grep -Ev -e '^\s+#|^#' - ;} abs() { local -i VAL=$1 echo "${VAL#-}" } calc_sum() { awk '{s+=$1} END {printf "%.0f", s}' "$*" ;} mk_calc() { awk "BEGIN { print $* }"; } # ex : mk_calc 7.5/3.2 => 2.34375 # Voir aussi expr : CACHE_USED=$( expr \( $CACHE_USED \* 1024 \) ) # A helper to make sure that Chrome is linked correctly function installation_status() { google-chrome-stable --version > /dev/null 2>&1 [ $? -eq 0 ] } ############ Source : https://github.com/danguita/scripts/blob/master/kickstart/kickstart-debian.sh say() { printf "\n[$(date --iso-8601=seconds)] %s\n" "$1" } # shellcheck disable=SC2317 confirm() { while true; do read -r -p "$1 (y/[n]): " answer case $answer in [Yy]* ) return 0; break;; [Nn]* ) return 1; break;; "" ) return 1; break;; * ) echo "Please answer yes or no.";; esac done } install_package() { sudo apt install --no-install-recommends -y "$@" } ######### quote () { local quoted=${1//\'/\'\\\'\'}; printf "'%s'" "$quoted" } dequote () { eval printf %s "$1" 2> /dev/null } ~~~ `get_dev.sh` ~~~bash #! /bin/bash # Respond to the question : if a new file is created, this will be on which block device ? # Input arg 1 : path (file) # Outpout : path (block device) set -euo pipefail IFS=$' \t\n' export LC_ALL=C NEW_FILE="$1" is_regular_file() { [[ -f $1 ]] } # check if directory exists is_dir() { [[ -d $1 ]] } get_parent_dir() { local CHEMIN="$1" while ! "$(dir_exists "$CHEMIN")" do CHEMIN=$(dirname "$CHEMIN") done echo "$CHEMIN" } get_device() { df -lP "$(get_parent_dir "$NEW_FILE")" |awk 'NR==2{print $1}' } get_device "$(get_parent_dir "$NEW_FILE")" ~~~ A la place de ~~~bash dir_exists /tmp/plop || mkdir -p /tmp/plop ~~~ Il est préférable de faire d'uuliser la commande `install` ~~~bash install -d /tmp/plop ~~~ Faire une division ~~~bash echo $(( 10 / 3 )) echo $(( VAR / 3 )) expr 10 / 3 calc() { awk "BEGIN { print ""$*"" }" } ~~~ ~~~bash my_command || { echo 'my_command failed' ; exit 1; } ~~~ Bash Colors \ source : https://github.com/moby/moby/blob/master/contrib/check-config.sh ~~~bash color() { local codes=() if [ "$1" = 'bold' ]; then codes=( "${codes[@]}" '1' ) shift fi if [ "$#" -gt 0 ]; then local code= case "$1" in # see https://en.wikipedia.org/wiki/ANSI_escape_code#Colors black) code=30 ;; red) code=31 ;; green) code=32 ;; yellow) code=33 ;; blue) code=34 ;; magenta) code=35 ;; cyan) code=36 ;; white) code=37 ;; esac if [ "$code" ]; then codes=( "${codes[@]}" "$code" ) fi fi local IFS=';' echo -en '\033['"${codes[*]}"'m' } wrap_color() { text="$1" shift color "$@" echo -n "$text" color reset echo } wrap_good() { echo "$(wrap_color "$1" white): $(wrap_color "$2" green)" } wrap_bad() { echo "$(wrap_color "$1" bold): $(wrap_color "$2" bold red)" ; } wrap_warning() { wrap_color >&2 "$*" red ; } error() { printf "${red}!!! %s${reset}\\n" "${*}" 1>&2 ; } failure() { local rc=$? echo -e "\t[FAILED]" return $rc } success() { echo -e "\t[ OK ]" return 0 } # Getpass read -s password read -s -p "Password: " get_free_space() { local chemin=$1 local -i free_mb free_mb="$(df --output=avail -m "$chemin" | tail -1 | tr -d ' ')" echo "$free_mb" } check_free_space() { # check_free_space /tmp/ 200 # will exit if /tmp/ less than 200MB local chemin=$1 local -i min_free_mb=$2 if [[ "$(get_free_space "$chemin")" -lt min_free_mb ]] then echo ERROR: No space left on device >&2 exit 28 fi } ~~~ Appelle d'une fonction bash depuis un autre shell \ Même UID pour deux utilisateurs différents ~~~bash cat </dev/null ; do sleep 5 done shift "$@" } ~~~ Strip char / trim => utiliser `xargs` ex : ~~~bash load5=$(echo $UPTIME | awk -F, '{print $5}' | xargs) ~~~ ## Gestion des logs ~~~bash #!/bin/bash NAME=plop LOG=/var/log/$NAME/$NAME.log exec >>$LOG 2>&1 exec &> >(tee -i /var/log/stackscript.log) ~~~ ## Gestion des erreurs ~~~bash #! /bin/bash # to combine `set -e` (same as: `set -o errexit`) with an ERR trap set -eE # same as: `set -o errexit -o errtrace` err_report() { echo "Error on line $1" } trap 'err_report $LINENO' ERR echo hello | grep foo # This is line number 9 ~~~ Source : https://unix.stackexchange.com/questions/39623/trap-err-and-echoing-the-error-line ## Exécution à la sortie ~~~bash trap 'rm -f "$TMP_INV_INI"' EXIT ERR ~~~ ou encore ~~~bash trap '[ "$?" -eq 61 ] || exit 61' 0 ~~~ ## No sigterm terminate ~~~bash #!/bin/bash trap '' SIGTERM ~~~ ## Utilisation d'aliases dans un script shell ~~~bash shopt -s expand_aliases source ~/.bash_aliases ~~~ ## Autres How to make sure only one instance of a bash script runs ? ~~~bash if [ $(pidof -x $0| wc -w) -gt 2 ]; then echo "More than 1" exit fi ~~~ Note : [[https://fr.wikipedia.org/wiki/NOP|NOP]] en bash : ~~~bash true ~~~ ~~~bash # We use this to print to the terminal when the context # of STDOUT is something other than the pty. declare -r TTY="$(tty)" printf $'%s %s\n' "${method}" "${path}" >${TTY} printf $'HTTP/1.1 %s %s\r\n' "${status:?}" "${msg:?}" | tee ${TTY} ~~~ ## Bash variable Substitution Supprimer une extention de fichier ~~~ $ VAR="plop.txt" $ echo ${VAR%.txt} plop ~~~ ~~~ $ var=sd_feeef_efe_g $ echo "${var#?*_}" feeef_efe_g ~~~ ~~~ $ var=toto-tt-ll $ echo "${var//-/_}" toto_tt_ll ~~~ ~~~ $ echo "${a/-/_}" toto_tt-ll ~~~ Case upper lower majuscule minuscule ~~~bash x="Hello" echo $x # HELLO y=${x,,} echo $y # hello z=${y^^} echo $z # HELLO ~~~ Dernier caractère d'une chaine ~~~bash echo "${str: -1}" # ou echo ${str:0-1} ~~~ Renommer en supprimant un prefix ~~~bash for fic in *.j2 ; do mv "$fic" "${fic#PREFIX_}" ; done ~~~ ----------- ~~~bash #!/bin/bash SCRIPT_PATH="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" ${SCRIPT_PATH}/sds_run.sh portal ~~~ ----- ~~~bash negate() { if [[ $# -eq 0 ]]; then echo "ERROR. ENOSYS Function not implemented" >&2 return 38 else # ! "${@}" "${@}" && return 1 || return 0 fi } ~~~ ~~~ $ negate true ; echo $? 1 $ negate false ; echo $? 0 $ true | negate ; echo $? ERROR. ENOSYS Function not implemented 38 $ false | negate ; echo $? ERROR. ENOSYS Function not implemented 38 ~~~ Voir aussi : * PIPESTATUS * pipefail