Unix tool tip

Tips on Unix utilities and related topics from @JohnDCook.

[Unix tool tip @UnixToolTip]

'The enjoyment of one's tools is an essential ingredient of successful work.' -- Donald E. Knuth

[Unix tool tip @UnixToolTip]

Gnu sed allows addresses of the form start~step. For example, 1~2 matches odd-numbered lines.

[Unix tool tip @UnixToolTip]

Useful Perl one-liners https://t.co/GrHMpSYPkj by @pkrumins

[Unix tool tip @UnixToolTip]

Latest edition to my Emacs config file:

;; Toggle frame maximization
(when (display-graphic-p)
(global-set-key (kbd "C-c m") #'toggle-frame-maximized))

[Unix tool tip @UnixToolTip]

delete from line 3 up to and including first blank line: sed 3,/^$/d filename

[Unix tool tip @UnixToolTip]

Selecting things in Emacs https://t.co/oREnFbmMky

[Unix tool tip @UnixToolTip]

The option -w or --ignore-all-space tells diff to ignore spaces in one line even where the corresponding line has none.

[Unix tool tip @UnixToolTip]

Search man pages for a given string: man -k string

[Unix tool tip @UnixToolTip]

sed script to delete blank lines /^$/d

[Unix tool tip @UnixToolTip]

What's one Linux command you wish you'd learned years ago? https://t.co/WPlWeQOuew

[Unix tool tip @UnixToolTip]

I recently noticed how often I move a file to a directory then cd into that directory.

Now I use the command "cd !$" several times a day.

[Unix tool tip @UnixToolTip]

Emacs search, ignoring punctuation or spaces between words: M-s w

[Unix tool tip @UnixToolTip]

Awk FAQ https://t.co/wROtN57Bme

[Unix tool tip @UnixToolTip]

In Emacs, you can delete all but one space with M-x just-one-space.

Typically bound to M-SPC (Alt-Space).

[Unix tool tip @UnixToolTip]

sed script to delete last line of a file: $d

[Unix tool tip @UnixToolTip]

List files in descending order of size: ls -S

[Unix tool tip @UnixToolTip]

Doing SQL-like joins on CSV files at the command line https://t.co/onyKxLYehD

[Unix tool tip @UnixToolTip]

sed debugger: https://t.co/yOX6JiEJfV

[Unix tool tip @UnixToolTip]

Show which lines are repeated in a sorted file: uniq -d

[Unix tool tip @UnixToolTip]

'It is easier to port a shell than a shell script.' -- Larry Wall

[Unix tool tip @UnixToolTip]

sed pattern for lines not containing spam: /spam/!