Add notes

notes/unix.md

@@ -6,6 +6,98 @@ Relancer la dernière commande : !!
 
 Relancer la dernière commande en sudo : sudo !!
 
+Template Bash ([source betterdev.blog](https://betterdev.blog/minimal-safe-bash-script-template/))
+
+```shell
+#!/usr/bin/env bash
+
+set -Eeuo pipefail
+trap cleanup SIGINT SIGTERM ERR EXIT
+
+script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)
+
+usage() {
+  cat << EOF # remove the space between << and EOF, this is due to web plugin issue
+Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...]
+
+Script description here.
+
+Available options:
+
+-h, --help      Print this help and exit
+-v, --verbose   Print script debug info
+-f, --flag      Some flag description
+-p, --param     Some param description
+EOF
+  exit
+}
+
+cleanup() {
+  trap - SIGINT SIGTERM ERR EXIT
+  # script cleanup here
+}
+
+setup_colors() {
+  if [[ -t 2 ]] && [[ -z "${NO_COLOR-}" ]] && [[ "${TERM-}" != "dumb" ]]; then
+    NOFORMAT='\033[0m' RED='\033[0;31m' GREEN='\033[0;32m' ORANGE='\033[0;33m' BLUE='\033[0;34m' PURPLE='\033[0;35m' CYAN='\033[0;36m' YELLOW='\033[1;33m'
+  else
+    NOFORMAT='' RED='' GREEN='' ORANGE='' BLUE='' PURPLE='' CYAN='' YELLOW=''
+  fi
+}
+
+msg() {
+  echo >&2 -e "${1-}"
+}
+
+die() {
+  local msg=$1
+  local code=${2-1} # default exit status 1
+  msg "$msg"
+  exit "$code"
+}
+
+parse_params() {
+  # default values of variables set from params
+  flag=0
+  param=''
+
+  while :; do
+    case "${1-}" in
+    -h | --help) usage ;;
+    -v | --verbose) set -x ;;
+    --no-color) NO_COLOR=1 ;;
+    -f | --flag) flag=1 ;; # example flag
+    -p | --param) # example named parameter
+      param="${2-}"
+      shift
+      ;;
+    -?*) die "Unknown option: $1" ;;
+    *) break ;;
+    esac
+    shift
+  done
+
+  args=("$@")
+
+  # check required params and arguments
+  [[ -z "${param-}" ]] && die "Missing required parameter: param"
+  [[ ${#args[@]} -eq 0 ]] && die "Missing script arguments"
+
+  return 0
+}
+
+parse_params "$@"
+setup_colors
+
+# script logic here
+
+msg "${RED}Read parameters:${NOFORMAT}"
+msg "- flag: ${flag}"
+msg "- param: ${param}"
+msg "- arguments: ${args[*]-}"
+
+``` 
+
 # Les fichiers
 
 All directories will be 775. All files will be 664 except those that were set as executable to begin with
@@ -68,3 +160,11 @@ Vider l'historique de Bash (source [StackOverflow](https://askubuntu.com/questio
 
     cat /dev/null > ~/.bash_history && history -c && exit
 
+
+[source](https://serverfault.com/questions/746909/journalctl-stop-following-without-exiting-pager)
+
+```
+# ^C after Shift-F does not completely quit
+journalctl -u nginx | less -FRSXM
+```
+