Commands by Buzzcp

Commands by Buzzcp (4)

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Use a variable in a find command. Useful in scripting.

You define your variable MYVAR with the desired search pattern: MYVAR= ...which can then be searched with the find command. This is useful if you in a script, where you want the arguments to be fed into the find command. The provided search is case insensitive (-iname) and will find all files and directories with the pattern MYVAR (not exact matches). This may go without saying, but if you want exact matches remove the \* and if you want case sensitive, use the -name argument.
This is sample output - yours may be different.
0

find . -iname \*${MYVAR}\* -print

Buzzcp · 2010-08-04 05:43:51 0
Edit video by cutting the part you like without transcoding.

Examples: The following will take frames starting at 15.2 seconds for a total of 45.9 seconds: mencoder -ss 15.2 -endpos 30.7 -oac copy -ovc copy mymovie.avi -o myeditedmovie.avi Keep in mind -endpos is the total time, i.e. the output video in this is 3 minutes 3 seconds in length: mencoder -ss 1 minute -endpos 2 minutes 3 seconds -oac copy -ovc copy mymovie.avi -o myeditedmovie.avi
This is sample output - yours may be different.
8

mencoder -ss <start point> -endpos <time from start point> -oac copy -ovc copy <invid> -o <outvid>

Buzzcp · 2010-01-11 22:59:13 1
Date shows dates at other times/dates

Use date to find the date at other days and times.
This is sample output - yours may be different.
5

date -d '2 weeks ago'

Buzzcp · 2009-04-28 03:09:23 4
Monitor dynamic changes in the dmesg log.

Other logs can be monitored similarly, e.g. watch "tail -15 /var/log/daemon.log"
This is sample output - yours may be different.
11

watch "dmesg |tail -15"

Buzzcp · 2009-04-14 03:13:17 5

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Delete empty, 24-hours-old directories recursively, without consider hidden directories

kill process by name

Or even easier, if it's available: $ killall firefox I have no idea why you would want to rely on two unusual dependencies to do something that can be done a hundred ways from coreutils...

Downsample mp3s to 128K

This will lower the quality of mp3 files, but is necessary to play them on some mobile devices.

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Blacklist usb storage

Some times you may ban usb to protect thefting of your personal data. Blacklist the usb_storage module by adding blacklist usb_storage to /etc/modprobe.d/blacklist.conf. To load the module manually, $sudo modprobe usb_storage.

easily find megabyte eating files or directories

sorts the files by integer megabytes, which should be enough to (interactively) find the space wasters. Now you can $ dush for the above output, $ dush -n 3 for only the 3 biggest files and so on. It's always a good idea to have this line in your .profile or .bashrc

Short one line while loop that outputs parameterized content from one file to another

Create a 5 MB blank file via a seek hole

Similar to the original, but is much faster since it only needs to write the last byte as zero. A diff on testfile and testfile.seek will return that they are the same.

generate random mac address

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