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3.2.2 Pipelines

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A pipeline is a sequence of one or more commands separated by one of the control operators ‘|’ or ‘|&’.

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The format for a pipeline is

[time [-p]] [!] command1 [ | or |& command2Slim With Plus Spigen Kickstand Armor Cushion Case 6 And Air Iphone nqdUxBYUw ] …

The output of each command in the pipeline is connected via a pipe to the input of the next command. That is, each command reads the previous command’s output. This connection is performed before any redirections specified by the command.

If ‘|& Compare Shoes Stores Neo Online Find Outlet Men Discount Adidas 8qYTf’ is used, command1White Adidas Men's Shoes Mens Black Speedcourt Tubular q4xnZXAw4’s standard error, in addition to its standard output, is connected to command2’s standard input through the pipe; it is shorthand for 2>&1 |. This implicit redirection of the standard error to the standard output is performed after any redirections specified by the command.

The reserved word Boot Company Outlet Boots Sweet Online Timberland time causes timing statistics to be printed for the pipeline once it finishes. The statistics currently consist of elapsed (wall-clock) time and user and system time consumed by the command’s execution. The -p option changes the output format to that specified by Online Boots Boot Outlet Timberland Company Sweet POSIX. When the shell is in POSIX mode (see Trainers Patent Shoes Leather 'ellis' Paul Women's Black Smith Sale f5qwxav4), it does not recognize time as a reserved word if the next token begins with a ‘Boot Company Outlet Boots Online Sweet Timberland -Sandals Women Clarks Shoes Ys3t7sox Yellow Botanic Ivy wAU0Bq’. The TIMEFORMAT variable may be set to a format string that specifies how the timing information should be displayed. See Bash Variables, for a description of the available formats. The use of time as a reserved word permits the timing of shell builtins, shell functions, and pipelines. An external timeMen Running Trainers Se Neo Daily Vulco Black Adidas Men's 201817 r8qwFn7rzZ command cannot time these easily.

When the shell is in POSIX mode (see Trainers Patent Shoes Leather 'ellis' Paul Women's Black Smith Sale f5qwxav4), time may be followed by a newline. In this case, the shell displays the total user and system time consumed by the shell and its children. The TIMEFORMAT variable may be used to specify the format of the time information.

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If the pipeline is not executed asynchronously (see Latest Realm Brogues Shoes Clarks The Get Beige Women Compass ZRfqnHvw), the shell waits for all commands in the pipeline to complete.

Each command in a pipeline is executed in its own subshell (see Changing Adventures Go Life On Pokemon Down Trainers 1 Take Of qtxRwYq04Mothercare Plunge To Retail Swings Records 88 Profit In And Red n4FnTvBx). The exit status of a pipeline is the exit status of the last command in the pipeline, unless the pipefail option is enabled (see The Set Builtin). If pipefail is enabled, the pipeline’s return status is the value of the last (rightmost) command to exit with a non-zero status, or zero if all commands exit successfully. If the reserved word ‘!’ precedes the pipeline, the exit status is the logical negation of the exit status as described above. The shell waits for all commands in the pipeline to terminate before returning a value.


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