Simple logging in BASH scripts
2011 July 04
A set of basic functions for writing to logs in BASH.
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| #!/bin/bash | |
| ## | |
| ## Simple logging mechanism for Bash | |
| ## | |
| ## Author: Michael Wayne Goodman <goodman.m.w@gmail.com> | |
| ## Thanks: Jul for the idea to add a datestring. See: | |
| ## http://www.goodmami.org/2011/07/simple-logging-in-bash-scripts/#comment-5854 | |
| ## Thanks: @gffhcks for noting that inf() and debug() should be swapped, | |
| ## and that critical() used $2 instead of $1 | |
| ## | |
| ## License: Public domain; do as you wish | |
| ## | |
| exec 3>&2 # logging stream (file descriptor 3) defaults to STDERR | |
| verbosity=3 # default to show warnings | |
| silent_lvl=0 | |
| crt_lvl=1 | |
| err_lvl=2 | |
| wrn_lvl=3 | |
| inf_lvl=4 | |
| dbg_lvl=5 | |
| notify() { log $silent_lvl "NOTE: $1"; } # Always prints | |
| critical() { log $crt_lvl "CRITICAL: $1"; } | |
| error() { log $err_lvl "ERROR: $1"; } | |
| warn() { log $wrn_lvl "WARNING: $1"; } | |
| inf() { log $inf_lvl "INFO: $1"; } # "info" is already a command | |
| debug() { log $dbg_lvl "DEBUG: $1"; } | |
| log() { | |
| if [ $verbosity -ge $1 ]; then | |
| datestring=`date +'%Y-%m-%d %H:%M:%S'` | |
| # Expand escaped characters, wrap at 70 chars, indent wrapped lines | |
| echo -e "$datestring $2" | fold -w70 -s | sed '2~1s/^/ /' >&3 | |
| fi | |
| } |
Commenter Jul added:
Very useful, thanks! You also could add timestamp at the beginning of each logged line :
dte=`date +’%Y%m%d %H:%M:%S’` echo -e “$dte $2″| …