category 09 / 10

Dates & math

Timestamps, arithmetic, base conversion, and date formatting.

005

entries

4 min

avg read

all 005 arithmetic 002 numfmt 001 units 001 bytes 001 formatting 001 seq 001 sequences 001 padding 001 loops 001 bc 001 decimals 001 precision 001 base-conversion 001 octal 001 debugging 001 date 001 timestamps 001 timezones 001

049Turn raw byte counts into human-readable sizes in any command's outputwc -c *.* | numfmt --field=1 --to=iec-i --suffix=B --padding=72026-10-274 min 042Count from 01 to 12 with the zeros already in placeseq -w 1 122026-10-133 min 034Do decimal math in the shell when $(( )) only gives you integersecho 'scale=3; 2/3' | bc2026-10-014 min 024Do math on zero-padded numbers without the shell reading them as octalecho $(( 10#$(date +%m) ))2026-09-174 min 014Turn a Unix timestamp into a readable date in any timezoneTZ=America/New_York date -d @1788373391 +'%F %T %Z'2026-09-024 min

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