Commands by psykotron

Commands by psykotron (4)

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Find common groups between two users
This is sample output - yours may be different.
2

grep -xFf <(groups user1|cut -f3- -d\ |sed 's/ /\n/g') <(groups user2|cut -f3- -d\ |sed 's/ /\n/g')

psykotron · 2015-03-04 18:23:59 0
Figure out what shell you're running

short, sweet, and works after sudoing a new shell. Show Sample Output
This is sample output - yours may be different.
```
  PID TTY          TIME CMD
 9155 pts/0    00:00:00 bash
```
3

ps -p $$

psykotron · 2011-02-05 16:22:17 0
Extract tarball from internet without local saving
This is sample output - yours may be different.
8

curl http://example.com/a.gz | tar xz

psykotron · 2009-12-20 18:47:49 0
Another Matrix Style Implementation

A bit different from some of the other submissions. Has bold and uses all c printable characters. Change the bs=value to speed up and increase the sizes of the bold and non-bold strings.
This is sample output - yours may be different.
5

echo -ne "\e[32m" ; while true ; do echo -ne "\e[$(($RANDOM % 2 + 1))m" ; tr -c "[:print:]" " " < /dev/urandom | dd count=1 bs=50 2> /dev/null ; done

psykotron · 2009-12-19 19:05:04 1

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Exclude inserting a table from a sql import

Starting with a large MySQL dump file (*.sql) remove any lines that have inserts for the specified table. Sometimes one or two tables are very large and uneeded, eg. log tables. To exclude multiple tables you can get fancy with sed, or just run the command again on subsequently generated files.

Rename files in batch

check spell in c source code

How to trim a video using ffmpeg

Will trim the video to 4 seconds starting from the beginning. The -vcodec , -acodec options are required so that ffmpeg knows in what video/audio format you want for the new video.

Insert a comment on command line for reminder

Comments can be used directly on the command line so I can save in the history a brief description of what command does.

Outputs a 10-digit random number

list block devices

Shows all block devices in a tree with descruptions of what they are.

A very simple and useful stopwatch

time read -sn1 (s:silent, n:number of characters. Press any character to stop)

Find Mac address

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

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