QuickBits-7: Convert .a file to .so file

.a files are just archive of .o object files. You need to just extract the files from the archive and package them as a shared object (.so).

ar -x myarchive.a



gcc -shared -Wl,-soname,mysharedlib.so *.o -o mysharedlib.so

QuickBits-6: Search and Kill Process

Many a times we need to find a process and kill it. The best way to Find a process is

Search

 pgrep -l [pattern] 

-l will list the name of the process or else only pid will be displayed. pgrep searches for the match in any part of the name including the arguments to the command.

Example:

 pgrep -l work



output

217 kworker/u:3

218 kworker/u:4

219 kworker/u:5

863 NetworkManager

900 ./a.out work

Search & Destroy

 pkill [pattern]

It will find and kill all the process that matches the Pattern.

QuickBits-5: Searching for previous commands

How to search and run the same command in bash ?

1. Up / down arrow keys [ good for previous few commands ]

2. Type ctrl+r and type any part of the command including its arguments. Bash will find and run it for you. Keep pressing ctrl+r until u find the right command.

Say you have run the following command sometime back

cd /myfolder/personal/secret/

you can search by typing ctrl+r and typing secret. Bash will find this command for you.