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Useful for switching over someone else's coding style who uses camelCase notation to your style using all lowercase with underscores.
And then to complete the task:
Go to target host;
$ssh host
Turn everything off:
$for i in `chkconfig --list | fgrep :on | awk '{print $1}'` ; do chkconfig --level 12345 $i off; done
Create duplicate config:
$while read line; do chkconfig --level $line on; done < foo
First the find command finds all files in your current directory (.). This is piped to xargs to be able to run the next shell pipeline in parallel.
The xargs -P argument specifies how many processes you want to run in parallel, you can set this higher than your core count as the duration reading is mainly IO bound.
The -print0 and -0 arguments of find and xargs respectively are used to easily handle files with spaces or other special characters.
A subshell is executed by xargs to have a shell pipeline for each file that is found by find. This pipeline extracts the duration and converts it to a format easily parsed by awk.
ffmpeg reads the file and prints a lot of information about it, grep extracts the duration line. cut and sed cut out the time information, and tr converts the last . to a : to make it easier to split by awk.
awk is a specialized programming language for use in shell scripts. Here we use it to split the time elements in 4 variables and add them up.
An improvement of the original (at: http://www.commandlinefu.com/commands/view/2872/update-twitter-via-curl) in the sense that you see a "from cURL" under your status message instead of just a "from API" ;-) Twitter automatically links it to the cURL home page.
Sometimes I just want to run a command quietly but all that keyboard shifting makes my fingers hurt. This little function does the job eg.:
$ if shh type less; then PAGER=less; fi
Installs pip packages defining a proxy
The output will likely point to '/etc/alternatives/java'.
So find out where that points by issuing ls -l like this:
ls -l /etc/alternatives/java
This is useful when you want to copy a file and also force a user, a group and a mode for that file.
Note: if you want to move that file instead of copying it, you can use
$install -o user -g group -m 755 /path/to/file /path/to/dir/ && rm -f /path/to/file
which will remove the file only if the install command went fine.
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
