The outputs of the programs are generally saved in files for further use. Sometimes, temporary files are created in order to use an output of a program as an input to another program. We can avoid creating temporary files and feed the output of a program as an input to another program using bash pipe and pipelines.
The pipe denoted by the operator
| connects the standard output of a process in the left to the standard input in the right process by inter process communication mechanism. In other words, the
| (pipe) connects commands by providing the output of a command as the input to another command.
Consider the following example:
$ cat /proc/cpuinfo | less
cat command, instead of displaying ...