nixCraft

Hello My friends,

Not sure if you were aware of this great bash function that I use daily in my job as a linux systems administrator.

This is called "Reverse I Search" this is tremendously useful when a system administrator needs to search for a previously typed command.

e.g.
About an hour ago I typed a command on my mac book pro into my bash terminal. This command was a difficult command to remember that cleared cache on the system.

Now I have typed about 25 other commands since I typed the command above. I know need this command again, and I can't remember the spelling or command name. However I remember that the command started with dsc.

From the terminal I hold ctrl and r. This invokes the reverse search. Next I type the letters that I remember from the command "dsc". Bash will automatically display the command.

Now press enter to execute the command that the search has found.

Have fun and hope this helps.

Jaysunn

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Have a look at what I have been working on
http://www.shellasaurus.com

Run the last command-name
Another
to call 1st arg
to call 2nd arg

__________________
Rocky Jr.
What's wrong? I hope I am not making you uncomfortable...

Never send a boy to do a mans job.

@rockdalinux

Sweeeeeeeet.

I was never aware of that one. Also this list can go on forever so please join.

Regards,


Jaysunn

__________________
Have a look at what I have been working on
http://www.shellasaurus.com

Getting dir name or only a file name from a long path is also pretty handy when you use rsync or scp / ssh and friends

No I want only dir name
Get filename but leaving the dir:
oh no foofilenameverylongfilename.txt is in current dir:
and the best one find and replace arg:
on no dir1 must be dir2:

FYI, they are called history modifiers.

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Thanks for sharing

though this is known to every just i want to share.

~/.bash_hisroty --contaions all your commands history
to check history size

echo $HISTSIZE

to change default history size(which is 500 in most of the linux flavors) to 20 commands history

HISTSIZE=20

To clear history

history -c

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Thanks,
Surendra Kumar Anne
Ubuntu: Simple, Stylish and Striking..!
Linux: Fast, friendly, flexible and .... free!
Support Open source.

I loathe 'features' that cause a key that normally prints a character to do something else. When I press !, I want ! to appear, dammit!

I remove its special meaning by clearing the histchars variable:

Code:

histchars=

To search history I use either ^R (reverse-i-search) or up-arrow, which I have bound to history-search-backward. This will find previous commands beginning with whatever I have already typed on the command
line.