bash.md

Bash Reference Manual:

• https://www.gnu.org/software/bash/manual/bash.html

set -euo pipefail # exit on failures set -exuo pipefail # exit on failures, and print all commands

read -ra var <<< "$VALUE"

run specific bash function over ssh:

• ssh user@host "$(typeset -f myfn); myfn"

export all functions:

• ssh user@host "$(typeset -f); myfn"

peek stdin/stdout of another process:

ps ax | grep PATTERN
cd /proc/145348/fd
tail -f 1

• regex

  if [[ ! "$IP_ADDR" =~ ^[0-9]{1,3}(\.[0-9]{1,3}){3}$ ]]; then
  

t7_copy_function() {
  test -n "$(declare -f "$1")" || return
  eval "${_/$1/$2}"
}

t7_rename_function() {
  t7_copy_function "$@" || return
  unset -f "$1"
}

multiline variable assignment:

read -r -d "" timelog <<EOF
{
   "taskKey": "$TASK",
   "workStarted": "${DATE}T08:00:00",
   "timeTotalSeconds": $SECONDS,
   "comment": "$DESC",
   "sendForReview": false,
   "worker": "$USER",
   "estimation": "auto"
}
EOF