[Linux] Bash time uso equivalente: Measure command execution time

Overview

The time command in Bash is used to measure the duration of execution of a command. It provides valuable information about how long a command takes to run, along with resource usage statistics such as CPU time and memory consumption.

Usage

The basic syntax of the time command is as follows:

time [options] [arguments]

Common Options

• -p: Use POSIX format for the output.
• -o FILE: Write the timing output to the specified file instead of standard error.
• -v: Provide a verbose output that includes more detailed resource usage information.

Common Examples

1. Basic usage: Measure the time taken by a command.

   time sleep 2
   

2. Using the -p option: Get the output in POSIX format.

   time -p ls
   

3. Redirecting output to a file: Save the timing information to a file.

   time -o timing.txt find / -name "*.txt"
   

4. Verbose output: Get detailed resource usage statistics.

   time -v grep "example" largefile.txt
   

Tips

• Use time with commands that you suspect may be resource-intensive to analyze their performance.
• Combine time with other commands in a pipeline to measure the execution time of complex operations.
• Remember that the time command measures the time of the command itself, not the time taken by any subprocesses it may spawn.