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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. | |
s_datestamp() { | |
while read -r line; do | |
timestamp=$(date -u '+%Y-%m-%d %H:%M:%S') | |
# by nature BASH might run process subst twice when using >&2 pipes. This is a lazy | |
# way to avoid dumping two timestamps on the same line: | |
if [[ "$line" != \[${timestamp%% *}* ]]; then | |
echo "[$timestamp] $line" | |
else | |
echo "$line" | |
fi | |
done | |
} | |
exec 1> >(s_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=$(date -u '+%s') | |
s_timestamp() { | |
while read -r line; do | |
curtime=$(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) | |
# ------------------------------------------------------------------------------------- | |
Hi
(echo 1 && sleep 3 && echo 2) | while IFS= read -r line; do echo "[$(date -Is)] $line"; done
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Also recommend using
while IFS= read -r line
so that prepended whitespace isn't removed.