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perl:tldr:5d647
perl: Edit all file lines [i]n-place with a specific replacement [e]xpression, saving a backup with a new extension.
$ perl -p -i'.${extension}' -e 's/${regular_expression}/${replacement}/g' ${filename}
try on your machine
This command is executed in the command line using Perl.
Let's break down the command:
perl
: This is the command to execute the Perl interpreter.-p
: This flag tells Perl to loop over the input file(s) line by line, executing the script on each line.-i'.${extension}'
: This flag instructs Perl to edit the input file in-place and create a backup of the original file with an extension appended.${extension}
is a variable that holds the desired extension for the backup file. The'.${extension}'
construct ensures the variable is expansion.-e
: This flag indicates that the following string is the script to be executed.s/${regular_expression}/${replacement}/g
: This is a regular expression substitution pattern. It tells Perl to find all occurrences of${regular_expression}
in each line of the input file and replace them with${replacement}
. Theg
flag stands for global, meaning all occurrences within a line should be replaced, not just the first one.${filename}
: This variable holds the name of the file on which the Perl script should be executed.
In summary, this command uses Perl to modify a file by replacing all occurrences of ${regular_expression}
with ${replacement}
in each line of ${filename}
. It also creates a backup of the original file with an appended ${extension}
.
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.