Use of linux pipeline commands

The combination of linux pipeline commands-general Linux technology-Linux technology and application information. The following is a detailed description. Use one pipeline
# Rpm-qa | grep licq

This command creates an MPS queue with the pipe character "|. The MPs queue uses rpm-qa command output (including all installed RPM packages in the system) as the grep command input to list RPM packages with licq characters.

Use multiple pipelines
# Cat/etc/passwd | grep/bin/bash | wc-l

This command uses two pipelines and sends the cat command (display the content of the passwd file) to the grep command using the first pipeline, the grep Command finds all rows containing "/bin/bash". The second pipe sends the grep input to the wc command, and the wc command counts the number of rows in the input. The function of this command is to find out how many users in the system use bash.