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E

• echo - write arguments to standard output
• echo, noecho - enable/disable terminal echo
• echo_wchar, wecho_wchar - write a complex character and immediately refresh
• echochar, wechochar - echo single-byte character and rendition to a window and refresh
• ecvt, fcvt, gcvt - convert a floating-point number to a string
• ed - edit text
• egrep - search a file with an ERE pattern (LEGACY)
• encrypt - encoding function
• endgrent, getgrent, setgrent - group database entry functions
• endhostent, gethostbyaddr, gethostbyname, gethostent, sethostent - network host database functions
• endnetent, getnetbyaddr, getnetbyname, getnetent, setnetent - network database functions
• endprotoent, getprotobynumber, getprotobyname, getprotoent, setprotoent - network protocol database functions
• endpwent, getpwent, setpwent - user database functions
• endservent, getservbyport, getservbyname, getservent, setservent - network services database functions
• endutxent, getutxent, getutxid, getutxline, pututxline, setutxent
• endwin - suspend Curses session
• env - set the environment for command invocation
• environ - array of character pointers to the environment strings
• environ, execl, execv, execle, execve, execlp, execvp - execute a file
• erand48 - generate uniformly distributed pseudo-random numbers
• erase, werase - clear a window
• erasechar, erasewchar, killchar, killwchar
• erf, erfc - error and complementary error functions
• errno - XSI error return value
• errno.h - system error numbers
• eval - Construct Command by Concatenating Arguments (Shell Built-in)
• ex - text editor
• exec - Execute Commands and Open, Close or Copy File Descriptors (Shell Built-in)
• exit - Cause the Shell to Exit (Shell Built-in)
• exit, _exit - terminate a process
• exp - exponential function
• expand - convert tabs to spaces
• expm1 - compute exponential functions
• export - Set Export Attribute for Variables (Shell Built-in)
• expr - evaluate arguments as an expression

• effective group ID
• effective user ID
• eight-bit transparency
• empty directory
• empty line
• empty string
• empty wide-character string
• environment variables
• epoch
• equivalence class
• era
• EREs Matching a Single Character or Collating Element
• ERE Ordinary Characters
• ERE Special Characters
• ERE Bracket Expression
• EREs Matching Multiple Characters
• ERE Alternation
• ERE Precedence
• ERE Expression Anchoring
• ERE Grammar
• Error Numbers
• executable file
• execute
• expand
• extended regular expression
• extended signed integral type
• extended security controls
• extended unsigned integral type