tee(1) - pipe fitting {oss}

cd(1) - change working directory {oss}

whereis(1) - locate programs {oss}

which(1) - locate a program file (or files) in the path {oss}

apropos(1) - locate commands by keyword lookup {oss}

script(1) - make typescript of terminal session {oss}

lastcomm(1) - show last commands executed in reverse order {oss}

getopt(1) - parse command options {oss}

false(1) - Return false value. {oss}

true(1) - Return true value. {oss}

test(1) - Condition evaluation utility. {oss}

apply(1) - apply a command to a set of arguments {oss}

xargs(1) - construct argument list(s) and execute utility {oss}

intro(1) - introduction to general commands (tools and utilities) {oss}

sh(1) - Public domain Bourne shell {oss}

csh(1) - a shell (command interpreter) with C-like syntax {oss}

ksh(1) - Public domain Korn shell {oss}

awk(1) - pattern-directed scanning and processing language {oss}

pwd(1) - return working directory name {oss}

m4(1) - macro language processor {oss}

whatis(1) - describe what a command is {oss}

time(1) - time command execution {oss}

Applications and Utilities

getusershell setusershell endusershell (3) - get legal user shells {oss}

Libraries and Functions

(The following links to subjects at this site retain your personalized selections.)

PERL - related

Communication Scripting

See also: Process Creation and Control - (starting and controlling child and peer processes)

Up to Specific Programming Languages

Up to Activity specific - Gateway topic to software used in specific activities. (application software, business, professional, science, education, etc.)