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uniq.1
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UNIQ(1L) MISC. REFERENCE MANUAL PAGES UNIQ(1L)
NAME
uniq - remove duplicate lines from a sorted file
SYNOPSIS
uniq [-cdu] [-f skip-fields] [-s skip-chars] [-w check-
chars] [-#skip-fields] [+#skip-chars] [--count] [--repeated]
[--unique] [--skip-fields=skip-fields] [--skip-chars=skip-
chars] [--check-chars=check-chars] [infile] [outfile]
DESCRIPTION
This manual page documents the GNU version of uniq. uniq
prints the unique lines in a sorted file, discarding all but
one of a run of matching lines. It can optionally show only
lines that appear exactly once, or lines that appear more
than once. uniq requires sorted input because it compares
only consecutive lines.
If the output file is not specified, uniq writes to the
standard output. If the input file is not specified, it
reads from the standard input.
OPTIONS
-_u, --_u_n_i_q_u_e
Only print unique lines.
-_d, --_r_e_p_e_a_t_e_d
Only print duplicate lines.
-_c, --_c_o_u_n_t
Print the number of times each line occurred along with
the line.
-, -_f, --_s_k_i_p-_f_i_e_l_d_s=_n_u_m_b_e_r
In this option, _n_u_m_b_e_r is an integer representing the
number of fields to skip over before checking for
uniqueness. The first _n_u_m_b_e_r fields, along with any
blanks found before _n_u_m_b_e_r fields is reached, are
skipped over and not counted. Fields are defined as a
strings of non-space, non-tab characters, that are
separated from each other by spaces and tabs.
--, -_s, +_s_k_i_p-_c_h_a_r_s=_n_u_m_b_e_r
In this option, _n_u_m_b_e_r is an integer represent the
number of characters to skip over before checking for
uniqueness. The first _n_u_m_b_e_r characters, along with
any blanks found before _n_u_m_b_e_r characters is reached,
are skipped over and not counted. If you use both the
field and character skipping options, fields are
skipped over first.
-_w, +_c_h_e_c_k-_c_h_a_r_s=_n_u_m_b_e_r
Specify the number of characters to compare in the
Sun Release 4.1 Last change: 1
UNIQ(1L) MISC. REFERENCE MANUAL PAGES UNIQ(1L)
lines, after skipping any specified fields and charac-
ters. Normally the entire rest of the lines are com-
pared.
The long-named options can be introduced with `+' as well as
`--', for compatibility with previous releases. Eventually
support for `+' will be removed, because it is incompatible
with the POSIX.2 standard.
Sun Release 4.1 Last change: 2