uniq

display unique lines of sorted file 

Command


SYNOPSIS

uniq [-c|-d|-u] [-f number1] [-s number2] [input_file [output_file]]

uniq [-c|-d|-u] [-number] [+number] [input_file [output_file]]


DESCRIPTION

uniq manipulates lines which occur more than once in a file. The file must be sorted, since uniq only compares adjacent lines. When you invoke this command with no options, it writes only one copy of each line in input_file to output_file. If you do not specify input_file or you specify -, uniq reads the standard input. If you do not specify output_file, uniq uses the standard output.

Options

-c 

precedes each output line with the number of times that line occurred in the input.

-d 

displays only lines which are repeated (one copy of each line).

-f number1 

ignores the first number1 fields when comparing lines. Blanks separate fields in the input.

-s number2 

ignores the first number2 characters when comparing lines. If you specify both -s and -f, uniq ignores the first number2 characters after the first number1 fields.

-u 

displays only those lines which are not repeated.

You may choose only one of the -c, -d, or -u options.

-number 

is an obsolete equivalent to -f number.

+number 

is an obsolete equivalent to -s number.


EXAMPLES

uniq

is a filter which prints one copy of each different line in its sorted input.

uniq -f 2 -s 1

compares lines starting with the 2nd character of the 3rd field.

uniq -d

outputs one instance of each repeated line in the input (and omits all unique lines).


DIAGNOSTICS

Possible exit status values are:

0 

Successful completion.

1 

Failure due to any of the following:

— invalid command line option
— missing number after -f
— missing or invalid number after -s
— inability to open the input or output file

Missing character skip count 

You specified -s but did not supply a number after the -s.

Missing number of fields to skip 

You specified -f but did not supply a number after the -f.

field skip not a number in "string

In a -number or +number construct, number wasn't valid. This could arise from a typo when entering a - option.


PORTABILITY

POSIX.2. x/OPEN Portability Guide 4.0. All UNIX systems. Windows 7. Windows Server 2008 R2. Windows 8. Windows Server 2012. Windows 10. Windows Server 2016.


AVAILABILITY

PTC MKS Toolkit for Power Users
PTC MKS Toolkit for System Administrators
PTC MKS Toolkit for Developers
PTC MKS Toolkit for Interoperability
PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition


SEE ALSO

Commands:
comm, sort


PTC MKS Toolkit 10.1 Documentation Build 15.