Bash-HacksOne useful bash one-liner every weekday, explained flag by flag.https://bash-hacks.com/en-usSee exactly what rsync will change before it changes anythinghttps://bash-hacks.com/2026/09/16/023-see-what-rsync-will-do-before-it-runs/https://bash-hacks.com/2026/09/16/023-see-what-rsync-will-do-before-it-runs/rsync -avni --delete site/ backup/Wed, 16 Sep 2026 00:00:00 GMTrsyncsyncbackupdry-runTotal a column grouped by another one in a single passhttps://bash-hacks.com/2026/09/15/022-total-a-column-grouped-by-another/https://bash-hacks.com/2026/09/15/022-total-a-column-grouped-by-another/awk '{n[$7]++; bytes[$7]+=$10} END {for (u in n) printf "%12.0f %6d %s\n", bytes[u], n[u], u}' access.log | sort -rn | headTue, 15 Sep 2026 00:00:00 GMTawklogsaggregationarraysFind the process that is quietly eating your memoryhttps://bash-hacks.com/2026/09/14/021-find-the-process-eating-your-memory/https://bash-hacks.com/2026/09/14/021-find-the-process-eating-your-memory/ps -eo pid,ppid,rss,etimes,pcpu,comm --sort=-rss | head -11Mon, 14 Sep 2026 00:00:00 GMTpsmemoryrssdebuggingSearch a project without walking into node_moduleshttps://bash-hacks.com/2026/09/08/018-search-a-project-without-walking-into-node-modules/https://bash-hacks.com/2026/09/08/018-search-a-project-without-walking-into-node-modules/find . \( -name node_modules -o -name .git \) -prune -o -type f -name '*.ts' -printTue, 08 Sep 2026 00:00:00 GMTfindprunesearchFind out which part of an HTTP request is actually slowhttps://bash-hacks.com/2026/09/07/017-find-out-which-part-of-a-request-is-slow/https://bash-hacks.com/2026/09/07/017-find-out-which-part-of-a-request-is-slow/curl -sS -o /dev/null -w "dns %{time_namelookup}\ntcp %{time_connect}\ntls %{time_appconnect}\nttfb %{time_starttransfer}\ntotal %{time_total}\n" https://www.debian.orgMon, 07 Sep 2026 00:00:00 GMTcurlhttplatencydebuggingBring back the commits you lost to a bad resethttps://bash-hacks.com/2026/09/04/016-bring-back-commits-lost-to-a-bad-reset/https://bash-hacks.com/2026/09/04/016-bring-back-commits-lost-to-a-bad-reset/git reflog show --date=relative HEADFri, 04 Sep 2026 00:00:00 GMTgit-reflogrecoveryhistoryCompare the output of two commands without writing a temp filehttps://bash-hacks.com/2026/09/03/015-compare-the-output-of-two-commands/https://bash-hacks.com/2026/09/03/015-compare-the-output-of-two-commands/diff <(sort packages-web01.txt) <(sort packages-web02.txt)Thu, 03 Sep 2026 00:00:00 GMTprocess-substitutiondiffcommTurn a Unix timestamp into a readable date in any timezonehttps://bash-hacks.com/2026/09/02/014-read-a-unix-timestamp-in-any-timezone/https://bash-hacks.com/2026/09/02/014-read-a-unix-timestamp-in-any-timezone/TZ=America/New_York date -d @1788373391 +'%F %T %Z'Wed, 02 Sep 2026 00:00:00 GMTdatetimestampstimezonesReuse SSH connections instead of authenticating every timehttps://bash-hacks.com/2026/09/01/013-reuse-ssh-connections-with-controlmaster/https://bash-hacks.com/2026/09/01/013-reuse-ssh-connections-with-controlmaster/ssh -o ControlMaster=auto -o ControlPath=~/.ssh/sockets/%r@%h-%p -o ControlPersist=600 devboxTue, 01 Sep 2026 00:00:00 GMTsshmultiplexingperformanceSee what is inside a tarball without extracting ithttps://bash-hacks.com/2026/08/31/012-see-whats-inside-a-tarball-without-extracting/https://bash-hacks.com/2026/08/31/012-see-whats-inside-a-tarball-without-extracting/tar -tzvf archive.tar.gzMon, 31 Aug 2026 00:00:00 GMTtararchivesinspectionFind out what a command actually is before you run ithttps://bash-hacks.com/2026/08/28/011-find-out-what-a-command-actually-is/https://bash-hacks.com/2026/08/28/011-find-out-what-a-command-actually-is/type -a grepFri, 28 Aug 2026 00:00:00 GMTtypealiasesdebuggingCheck how much disk space is left on every mounted filesystemhttps://bash-hacks.com/2026/08/27/010-check-how-much-disk-space-is-left/https://bash-hacks.com/2026/08/27/010-check-how-much-disk-space-is-left/df -hThu, 27 Aug 2026 00:00:00 GMTdfdiskfilesystemsSearch your Git history for a deleted function or stringhttps://bash-hacks.com/2026/08/26/009-search-git-history-for-deleted-code/https://bash-hacks.com/2026/08/26/009-search-git-history-for-deleted-code/git log -S"handleAuth" --oneline --allWed, 26 Aug 2026 00:00:00 GMTgit-loghistorysearchCheck where a domain name actually pointshttps://bash-hacks.com/2026/08/25/008-check-where-a-domain-points/https://bash-hacks.com/2026/08/25/008-check-where-a-domain-points/dig +short example.comTue, 25 Aug 2026 00:00:00 GMTdigdnsdebuggingSort a CSV by any column without opening a spreadsheethttps://bash-hacks.com/2026/08/24/007-sort-csv-by-column/https://bash-hacks.com/2026/08/24/007-sort-csv-by-column/sort -t, -k3 -nr sales.csv | head -20Mon, 24 Aug 2026 00:00:00 GMTsortcsvtextFind out what is actually eating your diskhttps://bash-hacks.com/2026/08/21/006-find-what-is-eating-your-disk/https://bash-hacks.com/2026/08/21/006-find-what-is-eating-your-disk/du -h -d1 . | sort -hr | head -10Fri, 21 Aug 2026 00:00:00 GMTdudisksortingFind out which process is sitting on port 8080https://bash-hacks.com/2026/08/20/005-find-process-on-port-8080/https://bash-hacks.com/2026/08/20/005-find-process-on-port-8080/lsof -nP -iTCP:8080 -sTCP:LISTENThu, 20 Aug 2026 00:00:00 GMTlsofportsdebugging