Scripts implementing additional Unix commands and hacks
calendar-cpp: Adds full CPP capabilities to the BSD calendar program. You can alias the calendar command to this script, although the options may be somewhat different.
factorial: Arbitrary precision factorial calculator - takes a positive integer of any size as its argument and computes the factorial. (Anything other than a positive integer causes an error.)
loc: Lines Of Code calculator - takes a C file as its parameter and computes how many non-comment, non-whitespace lines are in that file.
radix: Converts a number from one base to another. Can use any base.
randline: Selects a random line from a file, or one random line each from a list of files. Great for people like me who suffer from choice paralysis. I figured someone else might find it useful too.
rchmod: Works just like the chmod command except it changes permissions for all files in a directory tree, including the root of that tree. This is most useful for adding permissions to files hosted on a server so you can access them remotely.
rcmd: Adaptation of rchmod to execute any command recursively on a directory tree. Can use either a Unix command or a script, and can be set to execute a command on an entire directory for each directory it traverses (e.g. ls) or on individual files within each directory (e.g. chmod). As of this update, rchmod is now deprecated and will probably be removed in the future.
usleep: I noticed that my version of Linux did not have a usleep command so I wrote one in C. It's a fairly simple program that just does some basic error checking on the argument and then invokes the usleep() function in the POSIX API. This version of usleep has three possible exit codes: 0 for success, 1 for wrong number of arguments, and 2 for non-integer argument.
For calendar-cpp to work, the calendar program must be installed. loc is dependent on sed while factorial and radix are dependent on dc, but these two programs come preinstalled on almost every Unix/Linux system, so it shouldn't be a problem.
To install, set execute permission for all scripts and then copy them to /usr/local/bin.
$ cd bin
$ chmod a+x *
$ sudo cp * /usr/local/bin
Or just run the install script:
$ source install
Certain scripting features used by these scripts don't work on modern versions of Cygwin. I can get them to work on actual Unix/Linux systems and on old versions of Cygwin, but the current version doesn't run these scripts correctly for some reason. Features that no longer work on Cygwin include the getopts shell command and the branching commands in sed. So if you're a Unix person who uses Windows for convenience, consider using actual Unix/Linux to run these scripts. Sorry for the inconvenience.