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awk:tldr:16f09
This command is using the awk
programming language to perform text processing on the contents of a file specified by ${filename}
.
Here is a breakdown of the command:
-
awk
: This is the command used to invoke theawk
programming language interpreter. -
'{}'
: These curly braces contain the awk script or program that will be executed. -
if ($1 == "foo") print "Exact match foo";
: This checks if the first field ($1
) of each line in the file is equal to the string "foo". If it is, it prints the string "Exact match foo". -
else if ($1 ~ "bar") print "Partial match bar";
: If the first condition is not satisfied, this checks if the first field of the line matches the pattern "bar". The~
symbol is the pattern matching operator in awk. If there is a partial match, it prints the string "Partial match bar". -
`else print "Baz"': If neither of the previous conditions is satisfied, this prints the string "Baz".
-
${filename}
: This is the variable that holds the filename or path of the file on which the awk script will be executed.