Tip & Tricks

Terminal Shortcut Keys

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Key	Usage
Ctrl + a	Move to the beginning of line.
Ctrl + d	If you’ve type something, Ctrl + d deletes the character under the cursor, else, it escapes the current shell.
Ctrl + e	Move to the end of line.
Ctrl + k	Delete all text from the cursor to the end of line.
Ctrl + l	Equivalent to clear.
Ctrl + n	Same as Down arrow.
Ctrl + p	Same as Up arrow.
Ctrl + r	Begins a backward search through command history.(keep pressing Ctrl + r to move backward)
Ctrl + s	To stop output to terminal.
Ctrl + t	Transpose the character before the cursor with the one under the cursor, press Esc + t to transposes the two words before the cursor.
Ctrl + u	Cut the line before the cursor; then Ctrl + y paste it
Ctrl + w	Cut the word before the cursor; then Ctrl + y paste it
Ctrl + x + Ctrl + e	Launch editor defined by $EDITOR to input your command. Useful for multi-line commands.
Ctrl + z	Stop current running process and keep it in background. You can use fg to continue the process in the foreground, or bg to continue the process in the background.

Suppress Standard Output

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┌──(voldemort@IdeaPad)-[~]
└─$ cat traceconnect.d > /dev/null
 
┌──(voldemort@IdeaPad)-[~]
└─$ cat traceconnect.d 2> /dev/null
struct sockaddr_in{
	short 		sin_family;
	unsigned short 	sin_port;
	in_addr_t	sin_addr;
	char		sin_zero[8];
};
 
syscall::connect:entry
/arg2 == sizeof(struct sockaddr_in)/
{
	addr = (struct sockaddr_in*)copyin(arg1, arg2);
	printf("process:'%s' %s:%d", execname, inet_ntop(2, &addr->sin_addr), ntohs(addr->sin_port)); 
}
 

Join Command

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voldemort@IdeaPad:~$ cat name.txt 
1 John
2 Mike
3 Anne
4 Tom
5 Harry
voldemort@IdeaPad:~$ cat salary.txt 
1 $5,000
2 $500
3 $1,500
4 $4,500
5 $2,000
voldemort@IdeaPad:~$ join name.txt salary.txt 
1 John $5,000
2 Mike $500
3 Anne $1,500
4 Tom $4,500
5 Harry $2,000

tr

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Convert a file to all upper-case

voldemort@IdeaPad:~$ cat name.txt 
1 John
2 Mike
3 Anne
4 Tom
5 Harry
voldemort@IdeaPad:~$ tr a-z A-Z < name.txt 
1 JOHN
2 MIKE
3 ANNE
4 TOM
5 HARRY

Convert a file to all lower-case

voldemort@IdeaPad:~$ cat name.txt 
1 John
2 Mike
3 Anne
4 Tom
5 Harry
voldemort@IdeaPad:~$ tr A-Z a-z < name.txt 
1 john
2 mike
3 anne
4 tom
5 harry