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# Index: E

e (constant) : 9.1.1. Trigonometric Functions
-e option (sed)
  2.3.1. Specifying Simple Instructions
  2.3.2.3. Mixing options (POSIX)
ed editor : 2. Understanding Basic Operations
edits, pipelined : 4.4.4. Edits To Go
egrep program : 3. Understanding Regular Expression Syntax
else statements : (see if statements)
end
  of line : (see $ (dollar sign))
  of word : (see \<, \> escape sequences)
END procedure : 11.1.6. Control Flow
ENDFILE procedure (tawk) : 11.3.2.1. Tawk language extensions
"Ending delimiter missing" error : 2.3.1.1. Command garbled
ENVIRON variable
  8.6. System Variables That Are Arrays
  8.6.2. An Array of Environment Variables
environment variables : 8.6.2. An Array of Environment Variables
equal sign (=)
  == (equal to) operator : 7.8. Relational and Boolean Operators
  for printing line numbers : 5.9. Print Line Number
equivalence classes : 3.2.4.3. POSIX character class additions
EREs (extended regular expressions) : 3.2.4.3. POSIX character class additions
ERRNO variable (gawk) : 11.2.3.8. Additional variables
error messages
  11.2.1.4. Special filenames
  12.3.4. A Function for Reporting Errors
  awk : 2.4.2. Error Messages
  "command garbled"
    2.3.1.1. Command garbled
    5.1. About the Syntax of sed Commands
  sed : 2.3.1.1. Command garbled
errors
  debugging : 10.7. Debugging
  spelling, finding (example) : 12.1. An Interactive Spelling Checker
ESC character in vi : 5.6. List
escape sequences, awk
  7.6. Expressions
  11.1.1. Escape Sequences
  B.2.5.2. Escape sequences
escaping : (see backslash)
example programs : Sample Programs
exchange command : (see x command (sed))
exclamation point (!) : 4.2. A Global Perspective on Addressing
  != (not equal to) operator : 7.8. Relational and Boolean Operators
  !~ (does not match) operator
    7.5.1. Referencing and Separating Fields
    7.8. Relational and Boolean Operators
  csh and : 1.4. Four Hurdles to Mastering sed and awk
  logical NOT operator : 7.8. Relational and Boolean Operators
  tilde (~) operator : 7.5.1. Referencing and Separating Fields
exit statement : 8.3. Other Statements That Affect Flow Control
exp() : 9.1.1. Trigonometric Functions
exponentiation
  7.6. Expressions
  9.1.1. Trigonometric Functions
  11.1.2. Exponentiation
  ** operator : 7.6. Expressions
  ^ operator : 7.6. Expressions
expressions
  3.1. That's an Expression
  B.2.5. Expressions
  awk : 7.6. Expressions
  executing as commands : 10.3. The system() Function
  regular : (see regular expressions)
extended regular expressions (EREs) : 3.2.4.3. POSIX character class additions
extensions
  common awk : 11.2.1. Common Extensions
  gawk : 11.2.3. GNU awk (gawk)
  mawk : 11.2.4. Michael's awk (mawk)
  tawk : 11.3.2. Thompson Automation awk (tawk)
extent of matching : 3.2.12.1. The extent of the match
extracting file contents : 4.4.3. Extracting Contents of a File

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