Implicit assumption that other people's code is off-limits?
Most software on my machine has probably arrived from apt-get at some point or another. Even if it's all Perl scripts, I'm not going to overwrite them directly, only to have my changes either removed on update, or blowing up the package manager's consistency checksums, or [insert random reason I can't conceive, because I'm not familiar with internals of apt]. So it's either config files, command line, environmental variables, or I'm going to build a wrapper that bends installed software to my will.
Most software on my machine has probably arrived from apt-get at some point or another. Even if it's all Perl scripts, I'm not going to overwrite them directly, only to have my changes either removed on update, or blowing up the package manager's consistency checksums, or [insert random reason I can't conceive, because I'm not familiar with internals of apt]. So it's either config files, command line, environmental variables, or I'm going to build a wrapper that bends installed software to my will.