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| # FIRST VERSION - Outputs UTS formatted timestamp. | |
| # ------------------------------------------------------------------------------------- | |
| # handy pipe redirect that appends a datestamp to every line of output. Just paste this into | |
| # the top of a typical BASH script. Note that it outputs localtime due to limitations in | |
| # BASH printf (whichis used for speed reasons). Automated runner processes as a rule of thumb | |
| # should be set to UTC anyways, so it seems not a significant limitation. | |
| s_datestamp() { | |
| while IFS= read -r line; do | |
| # by nature BASH might run process subst twice when using >&2 pipes. This is a lazy | |
| # way to avoid dumping two timestamps on the same line: | |
| if [[ "$line" =~ \[[0-9]{4}-[^[:space:]]*\] ]]; then | |
| echo "$line" | |
| else | |
| printf "%(%Y-%m-%dT%H:%M:%S%z)T" "-1" | |
| fi | |
| done | |
| } | |
| exec 1> >(s_datestamp) | |
| exec 2> >(s_datestamp) | |
| # ------------------------------------------------------------------------------------- | |
| # SECOND VERSION - Outputs time since the script started. | |
| # ------------------------------------------------------------------------------------- | |
| # handy pipe redirect that appends a datestamp to every line of output. Just paste this into | |
| # the top of a typical BASH script. | |
| procstarttime=$(date -u '+%s') | |
| s_timestamp() { | |
| while IFS= read -r line; do | |
| curtime=$(date -u '+%s') | |
| deltatime=$(( curtime - procstarttime )) | |
| timestamp="$(printf "%03d:%02d" $(( deltatime / 60 )) $(( deltatime % 60 )))" | |
| # by nature BASH might run process subst twice when using >&2 pipes. This is a lazy | |
| # way to avoid dumping two timestamps on the same line: | |
| if [[ "$line" != \[${timestamp%% *}* ]]; then | |
| echo "[$timestamp] $line" | |
| else | |
| echo "$line" | |
| fi | |
| done | |
| } | |
| exec 1> >(s_timestamp) | |
| exec 2> >(s_timestamp) | |
| # ------------------------------------------------------------------------------------- | |
Also recommend using while IFS= read -r line so that prepended whitespace isn't removed.
Also recommend using
while IFS= read -r lineso that prepended whitespace isn't removed.
Highly belated, but I've updated the gist accordingly. I switched up to use bash builtin printf as well, which I found to be some magnitude faster than date though it means being unable to normalize to UTC timezone. Though for the purpose of a runner that shouldn't matter since runners should be set to UTC time anyway (and can be easily changed to UTC time via a variable export).
I'm experiencing an issue in which a failing process is not printing the last error message because of this trick. I'm guessing that the shell is configured with set -o pipefail and set -o errexit by GitLab CI and the failure doesn't allow s_timestamp to run and echo the timestamp prefixed line.
Any possible workarounds to allow the log to still go through?
Hi, for line 9, the timestamp has a shorter option for iso with seconds:
date -Is