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## Index: O

obtaining
  awk source code: 0.2. Availability of sed and awk
  commercial awk versions: 11.3.1. MKS awk
    11.3.2. Thompson Automation awk (tawk)
    11.3.3. Videosoft VSAwk
  examples: 0.3. Obtaining Example Source Code
  gawk source code: 11.2.3. GNU awk (gawk)
  mawk source code: 11.2.4. Michael's awk (mawk)
  sample programs: 0.. Sample Programs
  sed source code: 0.2. Availability of sed and awk
octal numbers: 7.6. Expressions
octothorpe (#) for comments: 5.2. Comment
  7.4.1. Describing Your Script
  B.2.2.2. Comments
  #n for suppressing output: 5.2. Comment
OFMT variable: 7.7. System Variables
  7.9. Formatted Printing
OFS variable: 7.7. System Variables
  7.7. System Variables
operators, awk: B.2.5.6. Operators
  arithmetic: 7.6. Expressions
  assignment: 7.6. Expressions
  Boolean: 7.8. Relational and Boolean Operators
  postfix versus prefix: 7.6. Expressions
  relational: 7.8. Relational and Boolean Operators
options: 2.2. Command-Line Syntax
  2.3.1. Specifying Simple Instructions
  (see also under specific option)
  awk: 2.4.3. Summary of Options
  combining: 2.3.2.3. Mixing options (POSIX)
  sed: 2.3.2.4. Summary of options
OR (||) operator: 7.8. Relational and Boolean Operators
order of operations: 3.1. That's an Expression
  commands in scripts: 4.1. Applying Commands in a Script
ORS variable: 7.7. System Variables
  7.7.1. Working with Multiline Records
output: 2.2. Command-Line Syntax
  buffer, flushing: 11.2.1.3. Flushing buffered output
  directing to files: 2.3.2.1. Saving output
    10.5. Directing Output to Files and Pipes
  directing to pipes: 10.5.1. Directing Output to a Pipe
  formatting (awk): 7.9. Formatted Printing
  formatting into columns: 10.6. Generating Columnar Reports
  saving: 4.3. Testing and Saving Output
  suppressing: 2.3.2.2. Suppressing automatic display of input lines
    5.2. Comment
  testing: 4.3. Testing and Saving Output
  to terminal: 11.2.1.4. Special filenames

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