It’s the man page section. From memory, section 1 is user programs, 2 is system calls, and 3 is standard C library calls, and 5 is file formats.
Wikipedia has the full explanation here.
More Related Contents:
- sed edit file in place
- Replace a string in shell script using a variable
- How to use variables in a command in sed?
- Why does my tool output overwrite itself and how do I fix it?
- What is the difference between a symbolic link and a hard link?
- How can I grep for a string that begins with a dash/hyphen?
- Portable way to pass file descriptor between different processes
- Why an ELF executable could have 4 LOAD segments?
- How to interleave lines from two text files
- sed or awk: delete n lines following a pattern
- Is PowerShell ready to replace my Cygwin shell on Windows? [closed]
- How to extract just plain text from .doc & .docx files? [closed]
- nginx error connect to php5-fpm.sock failed (13: Permission denied)
- Print lines in one file matching patterns in another file
- Extract specific columns from delimited file using Awk
- Explain awk command
- How to attach a process in gdb
- How do the UNIX commands mv and rm work with open files?
- How do I list all cron jobs for all users?
- Convert decimal to hexadecimal in UNIX shell script
- What does the ^M character mean in Vim?
- properly join two files based on 2 columns in common
- Diff files present in two different directories
- How to move or copy files listed by ‘find’ command in unix?
- Named Pipes (FIFOs) on Unix with multiple readers
- Creating string of repeated characters in shell script [duplicate]
- Configure cron job to run every 15 minutes on Jenkins
- Grepping for exact words with UNIX
- How to remove blank lines from a Unix file
- How to determine a terminal’s background color?