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E

• echo - write arguments to standard output
• ecvt(), fcvt, gcvt - convert a floating-point number to a string (LEGACY)
• ed - edit text
• encrypt() - encoding function (CRYPT)
• endgrent(), getgrent, setgrent - group database entry functions
• endhostent(), gethostent, sethostent - network host database functions
• endnetent(), getnetbyaddr, getnetbyname, getnetent, setnetent - network database functions
• endprotoent(), getprotobyname, getprotobynumber, getprotoent, setprotoent - network protocol database functions
• endpwent(), getpwent, setpwent - user database functions
• endservent(), getservbyname, getservbyport, getservent, setservent - network services database functions
• endutxent(), getutxent, getutxid, getutxline, pututxline, setutxent - user accounting database functions
• environ(), execl, execv, execle, execve, execlp, execvp - execute a file
• env - set the environment for command invocation
• erand48() - generate uniformly distributed pseudo-random numbers
• erfc(), erfcf, erfcl - complementary error functions
• erf(), erff, erfl - error functions
• erff(), erfl - error functions
• errno - error return value
• errno.h - system error numbers
• eval - construct command by concatenating arguments
• exec - execute commands and open, close, or copy file descriptors (UTILITY)
• exec(), execv, execle, execve, execlp, execvp - execute a file
• exit(), _Exit, _exit - terminate a process
• exp2(), exp2f, exp2l - exponential base 2 functions
• expand - convert tabs to spaces
• exp(), expf, expl - exponential function
• expm1(), expm1f, expm1l - compute exponential functions
• export - set export attribute for variable
• expr - evaluate arguments as an expression
• ex - text editor

• Effective Group ID
• Effective User ID
• Eight-Bit Transparency
• Empty Directory
• Empty Line
• Empty String (or Null String)
• Empty Wide-Character String
• Encoding Rule
• Entire Regular Expression
• Environment Variables
• Environment Variable Definition
• Epoch
• Equivalence Class
• Era
• Event Management
• Executable File
• Execute
• Execution Time
• Execution Time Monitoring
• Expand
• Extended Regular Expression (ERE)
• Extended Regular Expressions (DESCRIPTION)
• Extended Security Controls
• Extended Security Controls (General Concept)