find ./SRC/ -name "*.f90" | xargs perl -pi -e 's/iargc()/COMMAND_ARGUMENT_COUNT()/g'

try to replace each occurrence of iargc() with COMMAND_ARGUMENT_COUNT() in directory ./SRC for all files with suffix .f90. Parentheses should be included by to indicate they are normal characters in the context.

This method is usually called perl-pie because of the option -pi -e.

• The -p argument allows perl to loop over all files or lines passed as arguments.
• The -i argument has perl write the changes to the input file, and allows for backups with the optional field <backup-ext>.

• The -e argument specifies a line of perl code to execute. Multiple lines can be executed when separated with ; s.

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