Library › Book 19 › Pipes and Redirection
Pipes and Redirection
4.1🔒The Unix PhilosophyPipes (|) connect the output of one command to the input of another. Redirection (>, >>, <) connects commands to files. Together, they let…
4.2🔒PipesThe pipe operator | takes the standard output (stdout) of the left command and passes it as standard input (stdin) to the right command.
4.3🔒RedirectionRedirection connects command input and output to files instead of the terminal.
4.4🔒Essential Pipe CommandsThese commands are most useful when combined with pipes. Each one does one thing well.
4.5🔒Practical Pipe Chains for QAThese are patterns you will use almost daily when investigating production issues:
4.6🔒Real Log File Analysis PracticeHere is a realistic nginx access log snippet. Practice the pipe commands on data like this:
4.7🔒Exercises30. Use a pipe to count how many lines contain "ERROR" in the application log snippet above. 31. Use redirection to save the output of ls…
4.8🔒Career Translation- Designed pipe-based log analysis workflows that extracted error frequency, response-time percentiles, and request distribution from…
4.9🔒Q&AInterview Depth CheckPrompt: You have an nginx access log with millions of lines. You need to produce a report showing: the top 10 IP addresses by request…