index_O

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O command, vi
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OLDPWD environment variable 2nd
one-dimensional arrays
online help
operators
     arithmetic operators
     assignment
    for conditions
         arithmetic operators 2nd
         file attribute operators
         string comparison operators
     logical operators
     relational operators
     string operators
OPTARG environment variable 2nd
OPTERR environment variable
OPTIND environment variable 2nd
options [See command-line options]
order of precedence
     for aliases
     for commands
     for functions
     for scripts
     in arithmetic expressions
     overriding
     POSIX
orphan processes
OSTYPE environment variable
output
     standard 2nd 3rd
output files, as command-line options
output redirection [See I/O redirection]
output-meta variable, readline