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# Index: F

-f option (awk)
  9.3.2. Maintaining a Function Library
  11.2.3.1. Command line options
-f option (sed)
  2.2. Command-Line Syntax
  2.3.2. Script Files
  2.3.2.3. Mixing options (POSIX)
-F option (awk)
  2.4.1. Running awk
  7.5.1. Referencing and Separating Fields
factorials : 8.2.4. Deriving Factorials
faking dynamic regular expressions : 11.1.5. Faking Dynamic Regular Expressions
FAQ on awk : Other Sources of Information About sed and awk
fflush() : 11.2.1.3. Flushing buffered output
field separators : (see delimiters)
fields for awk records
  2.4.1. Running awk
  7.5. Records and Fields
  B.2.1. Records and Fields
  formatting as output : 7.9. Formatted Printing
  NF variable : 7.7. System Variables
FIELDSWIDTHS variable (gawk) : 11.2.3.6. Separating fields
File Transfer Protocol (FTP) : FTP
files
  closing
    10.2. The close() Function
    10.5.2. Working with Multiple Files
  editing multiple : 4.4.2. Making Changes Across a Set of Files
  extracting contents from : 4.4.3. Extracting Contents of a File
  filenames, special : 11.2.1.4. Special filenames
  getting information on : 7.8.1. Getting Information About Files
  Interleaf, converting : 6.1.1.1. Converting an Interleaf file
  multiple : 10.5.2. Working with Multiple Files
  multiple edits to : 4.4.1. Multiple Edits to the Same File
  nextfile statement : 11.2.1.5. The nextfile statement
  reading from
    5.11. Reading and Writing Files
    10.1.1. Reading Input from Files
  retrieving information from : 7.11. Information Retrieval
  scripts as : (see scripts)
  search path for : 11.2.3.2. An awk program search path
  special gawk : 11.2.3.7. Additional special files
  writing to
    2.3.2.1. Saving output
    5.11. Reading and Writing Files
    10.5. Directing Output to Files and Pipes
fixed strings : 3.2.3. Writing Regular Expressions
flags : 5.3. Substitution
  g (global)
    2.1. Awk, by Sed and Grep, out of Ed
    5.3. Substitution
  numeric : 5.3. Substitution
  p (print) : 5.3. Substitution
  w (write) : 5.3. Substitution
flow control
  6. Advanced sed Commands
  6.3.3. Building Blocks of Text
  11.1.6. Control Flow
  branching : 6.4.1. Branching
  d command (sed) : 5.4. Delete
  n command : 5.10. Next
flushing buffers : 11.2.1.3. Flushing buffered output
FNR variable
  7.7. System Variables
  10.1.2. Assigning the Input to a Variable
for loop
  8.2.3. For Loop
  8.4.1. Associative Arrays
formatting
  awk output : 7.9. Formatted Printing
  awk scripts : B.2.2. Format of a Script
  index (example program) : 12.2. Generating a Formatted Index
  system time : 11.2.3.11. Time management for programmers
FPAT variable (tawk) : 11.3.2.1. Tawk language extensions
Free Software Foundation (FSF) : Availability of sed and awk
FS variable
  7.5.1. Referencing and Separating Fields
  7.5.2. Field Splitting: The Full Story
  7.7. System Variables
  11.2.1.2. Obtaining individual characters
FTP (File Transfer Protocol) : FTP
Ftpmail : Ftpmail
function keyword : 9.3. Writing Your Own Functions
functions
  11.1.10. Functions
  B.2.6. Statements and Functions
  arithmetic
    9.1. Arithmetic Functions
    11.1.10. Functions
  built-in
    gawk : 11.2.3.9. Additional functions
    tawk : 11.3.2.2. Additional built-in tawk functions
  creating library of : 9.3.2. Maintaining a Function Library
  scope control (tawk) : 11.3.2.1. Tawk language extensions
  string-related : 9.2. String Functions
  time-related (gawk) : 11.2.3.11. Time management for programmers
  trigonometric : 9.1.1. Trigonometric Functions
  user-defined : 9.3. Writing Your Own Functions

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