03-19-2011
You can also use awk alone:
awk -F, '!_[$2]++' in >out
cat in
1,ww
2,qwq
2,asas
3,asa
4,asas
4,asas
cat out
1,ww
2,qwq
2,asas
3,asa
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asa(1) General Commands Manual asa(1)
NAME
asa - Interprets carriage-control characters
SYNOPSIS
asa [file...]
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
asa: XCU5.0
Refer to the standards(5) reference page for more information about industry standards and associated tags.
OPTIONS
None
OPERANDS
The pathname of a file to be read. If this parameter is omitted, standard input is read.
DESCRIPTION
The asa command writes its input files to standard output, mapping carriage-control characters from the text files to line-printer control
sequences.
The first character of every input line is removed and, depending on the character removed, an action performed on that character and the
rest of the line. If the character removed is: The rest of the line is output without change. A newline character is output, followed by
the rest of the input line. A form-feed character is output, followed by the rest of the input line. The newline character of the previ-
ous line is replaced with a carriage-return character, which is output, followed by the rest of the input line. If + is the first character
in the input, + has the same effect as the space character. [Tru64 UNIX] The character is output, followed by the rest of the input line.
EXIT STATUS
The following exit values are returned: Successful completion. An error occurred.
EXAMPLES
To view a file (created by a program using FORTRAN-style carriage control characters) on a terminal: asa file To format the FORTRAN output
of a.out and direct it to the printer: a.out | asa | lp
ENVIRONMENT VARIABLES
The following environment variables affect the execution of asa: Provides a default value for the internationalization variables that are
unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization vari-
ables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value,
overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes
of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments and input files). Determines the
locale for the format and contents of diagnostic messages written to standard error. Determines the location of message catalogues for the
processing of LC_MESSAGES.
SEE ALSO
Commands: lp(1)
Standards: standards(5)
asa(1)