Monday, 1 April 2013
Redirecting STDOUT to a Program
Redirecting STDOUT to a Program
- Pipes can connect commands:
command 1 / command
- sends STDOUT of command 1 to STDIN of command2 instead of the screen.
- STDERR is not forwarded across pipes
- command1/command2/command3...etc
Two of the basic tenets of UNIX philosophy are:make small programs that do one thing well,and expect the output of every program to become the input to another,as yet unknown,program.The use of pipes let you leverage the effects of these two design principles to create extremely powerful chains of command to achieve your desired result.Most command-line program that operate on files can also accept input in standard in,and output to standard out.Some commands like tr are designed to only operate within a pipe.
Any command that writes to stander output can be used on the left-hand side of a pipe.
Any command that reads from stander input can be used on the right-hand side of a pipe.
Multiple command can be chained together with pipes.
Example output:[student@stationX man]$ pwd
/usr/share/man
[student@stationX man]$ ls -c/ tr 'a-z' 'a-z'
MAN1 MAN3 MAN5 MAN7 MAN9 PT_BR WHATIS
MAN2 MAN4 MAN6 MAN8 MANN TMAC.H
In the example above,lower case letter of the alpha
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Hi! I am Kuldipsinh, a certified Indian Network Consultant, Pro Blogger, Computer Engineer & Software Editor and an addicted Web Developer.
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