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STDOUT
ps -ef | wc -l
The ps program prints to STDOUT the proccesses running on the system. This output is then piped to the ?STDIN (STanDard INput) of the wc (word count) program, which with the -l flag prints the number of lines of input it got to STDOUT. STDOUT, if you type that command at a shell, will be piped to the window you are looking at so you'll see the output (which is a number roughly equal to the number of proccesses running on your system).
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STDOUT
STDOUT
In many programming and scripting languages, when you use a print or similar statement, you are print to STDOUT, which stands for STanDard OUTput. It's the standard place where data is sent to. It may be attached to a pipe which may go to the console, a file, or into another program. That's how programs are chained together on the UNIX command line.ps -ef | wc -l
The ps program prints to STDOUT the proccesses running on the system. This output is then piped to the ?STDIN (STanDard INput) of the wc (word count) program, which with the -l flag prints the number of lines of input it got to STDOUT. STDOUT, if you type that command at a shell, will be piped to the window you are looking at so you'll see the output (which is a number roughly equal to the number of proccesses running on your system).
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