Commands by donjuanica

Commands by donjuanica (2)

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See how much time you've spent logged in

Add -n to last command to restrict to last num logins, otherwise it will pull all available history. Show Sample Output
This is sample output - yours may be different.
```
421h:42m:18s
```
-1

last|grep `whoami`|grep -v logged|cut -c61-71|sed -e 's/[()]//g'|awk '{ sub("\\+", ":");split($1,a,":");if(a[3]){print a[1]*60*60+a[2]*60+a[3]} else {print a[1]*60+a[2] }; }'|paste -s -d+ -|bc|awk '{printf "%dh:%dm:%ds\n",$1/(60*60),$1%(60*60)/60,$1%60}'

donjuanica · 2015-09-19 03:02:43 0
Print a monthly calendar with today's date highlighted

The cal command is handy, but sometimes you want to quickly see today's date highlighted. That's why I came up with this quick command. Much like http://www.commandlinefu.com/commands/view/1342/show-this-months-calendar-with-todays-date-highlighted but cleaner and more succinct. Show Sample Output
This is sample output - yours may be different.
```
     June 2012
Su Mo Tu We Th Fr Sa
                1  2
 3  4  5  6  7  8  9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
```
3

cal | grep -E --color "\b`date +%e`\b|$"

donjuanica · 2012-06-27 20:30:40 0

What's this?

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Enable verbose boot in Mac OS X Open Firmware

print all network interfaces' names and IPv4 addresses

ifconfig can't properly display interface's name longer 9 symbols,also it can't show IPs added thru ip command, so 'ip' should be used instead. This alias properly shows long names, bond interfaces and all interface aliases. loopback interface is ignored, since its IP is obvious

list block devices

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

Go to the previous sibling directory in alphabetical order

Based on linkinpark342 suggestion. Sometimes you have to browse your way through a lot of sub-directories. This command cd to the previous sub-directory in alphabetical order. For example, if you have the directories "lectures/01-intro", "lectures/02-basic", "lectures/03-advanced" and so on, and your PWD is "02-basic", it jumps to "01-intro".

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Processes by CPU usage

Reverse ssh

Both hosts must be running ssh and also the outside host must have a port forwarded to port 22.

Encode a string using ROT47

This command will encode a string using the ROT47 cipher.

Perform a branching conditional

This will perform one of two blocks of code, depending on the condition of the first. Essentially is a bash terniary operator. To tell if a machine is up: $ ping -c1 machine { echo succes;} || { echo failed; } Because of the bash { } block operators, you can have multiple commands $ ping -c1 machine && { echo success;log-timestamp.sh }|| { echo failed; email-admin.sh; } Tips: Remember, the { } operators are treated by bash as a reserved word: as such, they need a space on either side. If you have a command that can fail at the end of the true block, consider ending said block with 'false' to prevent accidental execution

Insert the last command without the last argument (bash)

$/usr/sbin/ab2 -f TLS1 -S -n 1000 -c 100 -t 2 http://www.google.com/ then $!:- http://www.commandlinefu.com/ is the same as $/usr/sbin/ab2 -f TLS1 -S -n 1000 -c 100 -t 2 http://www.commandlinefu.com/

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