Commands by peter

Commands by peter_shook (2)

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find examples of multiline idioms in Linux drivers source code

The Linux Cross Referencer is nice: https://elixir.bootlin.com/linux/latest/source but when you want to find an example usage of an idiom across multiple lines, piping the ack-grep output to less is quicker. The --cc limits the search to C code, -i to ignore case, -A4 because most wait_event variants have 4 arguments that may be on lines after the function name. Use --make to search makefiles Show Sample Output
This is sample output - yours may be different.
```
--
drivers/char/ipmi/ipmb_dev_int.c:92:            ret = wait_event_interruptible(ipmb_dev->wait_queue,
drivers/char/ipmi/ipmb_dev_int.c-93-                            !list_empty(&ipmb_dev->request_queue));
drivers/char/ipmi/ipmb_dev_int.c-94-            if (ret)
drivers/char/ipmi/ipmb_dev_int.c-95-                    return ret;
drivers/char/ipmi/ipmb_dev_int.c-96-
--
```
0

ack --cc -i -A4 wait_event linux/drivers | less -i # / list_empty

peter_shook · 2021-06-25 11:03:47 180
compare two Microsoft Word documents

http://meld.sourceforge.net/ http://www.winfield.demon.nl/
This is sample output - yours may be different.
2

meld <(antiword microsoft_word_a.doc) <(antiword microsoft_word_b.doc)

peter_shook · 2009-04-23 15:14:32 11

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Merge files, joining each line in one line

Change every instance of OLD to NEW in file FILE

Very quick way to change a word in a file. I use it all the time to change variable names in my PHP scripts (sed -i 's/$oldvar/$newvar/g' index.php)

Check syntax of all Perl modules or scripts underneath the current directory

Finds all *.p[ml]-files and runs a perl -c on them, checking whether Perl thinks they are syntactically correct

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Remind yourself to leave in 15 minutes

If you spend most of your time in front of the terminal, leave is a useful reminder. Leave can have absolute form: leave 1555 reminds you to leave at 3:55PM

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

Creates a symbolic link or overwrites an existing one

-n: dereference the existing link -v: (optional) to be sure of what is being done -f: force the deletion of the existing one -s: creates a symlink Be careful: the destination can also be a file or a directory and it will be overwritten.

Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Create multiple subfolders in one command.

Instead of typing separate commands to create various subfolders, we can create multiple subfolders by listing them between brackets and separated by commas.

Monitor changed files into a log file, with day rotation, using fswatch (MacOS)

This command monitors changes in the current folder structure (subfolders included) and files, and log it into a hidden file in the same folder, called `.file_changes_YYMMDD.log`. Modify the `--exclude` parameters to define what should be skipped.

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