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calcurse

1 min read · data calendar daylight savings

Setup The UK government keeps an ics file with clock. 1wget https://www.gov.uk/when-do-the-clocks-change/united-kingdom.ics 2calcurse -i united-kingdom.ics

Convert a text file from one encoding type to another with: 1iconv -f ascii -t utf8 oldfilename > newfilename Available options are: ISO-8859-15 UTF-8 ASCII Lots more Generate a full list of encoding types available with: 1iconv -l

clock

1 min read · basics time

Show system time: 1date Show hardware time: 1sudo hwclock -r Change system time to match hardware time: 1sudo hwclock --hctosys Change hardware time to match system time: 1sudo hwclock --systohc Manually set the hardware time to a specified date: 1sudo hwclock --set --date="8/25/19 13:30:00" Normal Date 1date +%d/%m/%y …

column

1 min read · basics format json

Put output into column. 1du -h /etc/* | column Reformat file with an explicit separator (-s): 1column -ts: /etc/passwd Give columns names (-N), so you can hide some (-H): 1column -ts: -N User,PW,UID,GID,Description,Home,shell -H PW,GID /etc/passwd Reorder with -O (unspecified items remain): 1column -ts: -N …

Commit for Another

1 min read · data git

You can make Alice the author, while you are still the commiter: 1name="Alice Bobinson" 2email="alice@email.com" 3 4git add ${file} 5git commit --author="${name} <${email}>" Or, make Alice both the committer and the author: 1git -c user.name="${name}" -c user.email="${email}" commit -m "${message}"

conditionals

1 min read · basics

If statements Test statement equality as so: 1 2read t1 3read t2 4if test $t1 != $t2; then 5 echo 'variables do not match' 6else 7 echo 'variables match' 8fi 9exit 0 Case Structure These deal with multiple states rather than forking conditions. Example: 1 2#!/bin/bash 3 4# Simple case demonstration 5 6echo "What's your …

Convert Spreadsheets

1 min read · data sc-im

Convert between spreadsheet formats with sc-im. 1sc-im --quiet --quit_afterload --nocurses --export_csv ${file}.xlsx 2sc-im --quiet --quit_afterload --nocurses --export_tab ${file}.sc 3sc-im --quiet --quit_afterload --nocurses --export_mkd ${file}.csv 4sc-im --quiet --quit_afterload --nocurses --export_txt ${file}.tsv

cron

2 min read · basics time

Cronie The cronie program is also known as crond. Install 1sudo apt search -n ^cron Once installed, search for the service name, and start it. 1sudo systemctl list-unit-files | grep cron 2sudo systemctl enable --now $NAME Usage Show your current crontab: 1crontab -l You can put this in a file and edit it: 1crontab -l > …

deduplicate

1 min read · system deduplicate maintenance storage

rdfind: find duplicate files, then delete them, or turn them into links. Ask if a directory has duplicates (rdfind will not delete anything): 1rdfind $dir 2$EDITOR results.txt Replace the duplicated files with hard links. 1rdfind -makehardlinks true $dir

Default Programs

1 min read · defaults mime type

Install the package xdg-utils, then make very liberal use of the tab button. Ask Ask what type of application opens an mkv file: 1xdg-mime query default video/mkv Same with pdf: 1xdg-mime query default application/pdf Ask what file-type book.pdf uses. 1xdg-mime query filetype book.pdf Set Set the mime type of mp4 …