Monday, September 5, 2011

Pipes in Unix Based Operating Systems

A unique approach to Unix-based operating system like Linux to be offered in two discrete commands, and a new pipe (lines) generated using the concept of command. | Command2 For example, Command1 considering. Here, the first production order is generated by the second order is the standard input. We get many orders by maintaining the input output relationships can develop more and more complex UNIX command sequences.

Grep "^ d" | ls-l will have a more Linux-specific examples. This command displays the current working directory is a description of the directories, the 'LS-l' command is the output of the grep command, which displays only those rows that the 'D' (they start with nothing but the details becomes the input files).

ls-l | grep "^ d" | wc-l

This command displays the number of the file in the directory.

grep "$ execute" / etc / passwd | wc-l

The order of the machine whose default shell is bash displays the number of users.

Cut t ":" f and 3 / / passwd | sort - a | tail - L

This command is a number used the largest in the system displays the UID number.sends the order number (last one).

T Order

'T' command sequence in a piping is used to save intermediate results.Thus, the piping in order to use this pipe will break.

Here, the details of the directory to store the file xyz.

ls-l | grep ^ "d" | t xyz | wc-l

Pqr file sequence number in the directory, type the following piping, displayed on the screen.

ls-l | grep ^ "d" | t xyz | wc-l | T pqr

CMP Order

CMP utility compares two files of any type and writes results to standard output. By default, the CMP is silent if the files are the same. If they are different, the difference between byte and line number at which it has been reported previously.

Bytes and lines are numbered beginning with one.

For example, CMP file1 file2

Com Order

Comm compares two sorted files line by line command is used to.

LEFT_FILE and compare sorted files line by line RIGHT_FILE.

-1 Suppressed lines that are unique to left file.

-2 Suppress files that are unique to the file.

-3 Suppress lines that appear in both the left file and the file are correct. For example, com p1 p2.

A set of procedures to help connect the pipes so that the output of one becomes the other input। This gives a user a convenient way to browse through a large amount of data.











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