perl:tldr:dc70e

perl: Run a multi-line replacement [e]xpression on a file, and save the result in a specific file.

perl

$ perl -p -e 's/${foo\nbar}/${foobar}/g' ${path-to-input_file} > ${path-to-output_file}

try on your machine

This command is a command-line instruction written in Perl programming language. Here is a breakdown:

perl: This command invokes the Perl interpreter.

-p: This flag, used in combination with -e, enables automatic printing of each line after executing the script code. It loops through the input file line by line and applies the script code.

-e: This option allows you to specify the script code directly on the command line.

's/${foo\nbar}/${foobar}/g': This is the script code surrounded by single quotes. It is a Perl substitution command (s/regex/replacement/) that searches for the string "${foo\nbar}" and replaces it with "${foobar}". The "g" at the end of the code signifies a global replacement, meaning all occurrences of the pattern will be replaced.

${path-to-input_file}: This is the variable representing the path to the input file. It should be replaced with the actual path in the command.

>: This symbol is used to redirect the output of the command to a file.

${path-to-output_file}: This variable represents the path to the output file. It should also be replaced with the desired path.

So, the command will read the contents of the input file, perform the substitution specified in the script code, and then save the modified contents to the output file.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

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