| AMD | Advanced Micro Devices |
| API | Application Programmer s Interface |
| ASCII | American Standard Code for Information Interchange |
| AT&T | American Telephone and Telegraph |
| AWK | Aho-Weinberger-Kernighan |
| BASH | Bourne-Again SHell |
| BB | Basic Block |
| BBG | Basic Block Graph |
| BNF | Backus-Naur Form |
| BSD | Berkeley Software Distribution |
| BSS | Block Started by Symbol |
| CMU | Carnegie Mellon University |
| COW | Copy-On-Write |
| CPU | Central Processing Unit |
| CSE | Common Subexpression Elimination |
| DEC | Digital Equipment Corporation |
| DMA | Direct Memory Access |
| DNS | Domain Name Server |
| DL | Dynamically Loaded |
| DWARF | Debugging with Attribute Record Format |
| EMACS | EMACS Makes a Computer Slow |
| ELF | Executable and Linking Format |
| EOF | End of File |
| EXT2 | 2nd Extended Filesystem |
| EXT3 | 3rd Extended Filesystem |
| FIFO | First-In-First-Out |
| FQDN | Fully Qualified Domain Name |
| FS | Field Separator |
| FSF | Free Software Foundation |
| GCC | GNU Compiler Collection |
| GCOV | GNU Coverage |
| GDB | GNU DeBugger |
| GID | Group ID |
| GLIBC | GNU C Library |
| GMT | Greenwich Mean Time |
| GNU | GNU s Not Unix |
| GOT | Global Offset Table |
| GPROF | GNU Profiler |
| HTML | Hypertext Markup Language |
| HTONL | Host TO Network Long |
| HTONS | Host TO Network Short |
| HUP | HangUP |
| IP | Internet Protocol |
| IBM | International Business Machines |
| IPC | Inter-Process Communication |
| IPv4 | Internet Protocol Version 4 |
| KB | KiloByte |
| LIFO | Last-In-First-Out |
| LISP | List Processor |
| MINIX | Miniature Unix |
| MIT | Massachusetts Institute of Technology |
| MMU | Memory Management Unit |
| MUTEX | Mutual Exclusion |
| NF | Number of Fields |
| NFS | Network File System |
| NPTL | Native POSIX Thread Library |
| NR | Number of Record |
| NTOHL | Network TO Host Long |
| NTOHS | Network TO Host Short |
| OFS | Output Field Separator |
| ORS | Output Record Separator |
| OSI | Open Source Initiative |
| PDP | Programmed Data Processor |
| PGRP | Process Group |
| PIC | Position Independent Code |
| PID | Process Identifier |
| POSIX | Portable Operating System Interface |
| PWD | Present Working Directory |
| QID | Queue Identifier |
| QPL | Qt Public License |
| RAM | Random Access Memory |
| REGEX | Regular Expression |
| RS | input Record Separator |
| SCSH | Scheme Shell |
| SED | Stream Editor |
| SPLINT | Secure Programming Lint |
| STDERR | Standard Error |
| STDIN | Standard Input |
| STDOUT | Standard Output |
| SYSV | System 5 |
| TAR | Tape Archive |
| TCL | Tool Command Language |
| TCP | Transmission Control Protocol |
| TLB | Translation Lookaside Buffer |
| UDP | User Datagram Protocol |
| UID | User ID |
| UTC | Coordinated Universal Time |
| VFS | Virtual File System |
| VI | Visual Interface |
| VPATH | Virtual Path |