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egrep:tldr:7a42d
This command is a combination of two commands in Unix-like systems: cat
and egrep
.
-
cat
is short for "concatenate" and is used to display the content of files. In this command,${filename}
represents a variable that should contain the name of the file you want to display. The commandcat ${filename}
will display the content of the file specified by the value of${filename}
. -
egrep
is a command used for searching patterns in text using regular expressions. In this command,${search_pattern}
represents a variable that should contain the specific pattern you want to search for. The commandegrep ${search_pattern}
will search for the given pattern in the output generated by thecat
command.
Combining both commands with a pipe |
, the output of cat ${filename}
is sent as input to the egrep ${search_pattern}
command, allowing you to search for a specific pattern within the content of the file.