Question about awk command Post: 302939606

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Question about a awk command

Hi, I am studying an awk command: awk '{ sub(/\/\/.*/, "", $NF); print }' input.txt The input.txt is: char*s1="//hello"; //comment //delete /* hello //*/ The output is : char*s1="//hello"; /* hello

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sum

sum(1)							      General Commands Manual							    sum(1)

NAME

       sum - Displays the checksum and byte count in block-size (1024) units of a file

SYNOPSIS

       sum [-o	| -r] [file...]

       The  sum  command reads file and calculates a 16-bit checksum and the byte count in block-size (1024) units in the file.  If the file argu-
       ment is omitted, sum reads standard input.

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       sum:  XCU5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

OPTIONS

       [Tru64 UNIX]  Uses an algorithm to compute the checksum using word-by-word computation.	Uses an alternate algorithm to compute the  check-
       sum (rigorous byte-by-byte computation rather than the word-by-word computation).

	      [Tru64 UNIX]  This is the default.

OPERANDS

       The file for which a checksum is to be computed.  If this operand is omitted, standard input is used.

DESCRIPTION

       The checksum and number of blocks are written to standard output.  The sum command is generally used to determine if a file that was copied
       or communicated over transmission lines is an exact copy of the original. The sum command writes the space used in 1024-byte units.

       [Tru64 UNIX]  The checksum is calculated using a rigorous byte-byte computation by default.

   System V Compatibility
       [Tru64 UNIX]  The checksum algorithms for the default sum command and the SVID 2 compliant sum command are reversed.  The SVID 2  compliant
       sum  command  uses  the	word-by-word  algorithm by default and uses the byte-by-byte algorithm if you specify the -r option on the command
       line.

NOTES

       The sum utility is marked LEGACY in XCU Issue 5.  [Tru64 UNIX]  The default algorithm is no longer the word-by-word computation	algorithm.
       It  was	changed  to the 4.3BSD default algorithm.  The algorithms used may not be portable, that is, the same checksum may not be produced
       for the same input on different systems.  Portable applications should use cksum.

EXIT STATUS

       The following exit values are returned: Successful completion.  An error occurred.

EXAMPLES

       To display the checksum of datafile and the number of blocks in this file, enter: sum datafile

       If the checksum of datafile is 1605 and if the file contains 3 blocks, sum displays: 1605 3 datafile

ENVIRONMENT VARIABLES

       The following environment variables affect the execution of sum: 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 multibyte characters in arguments).  Determines the locale for the  for-
       mat  and  contents  of  diagnostic messages written to standard error.  Determines the location of message catalogues for the processing of
       LC_MESSAGES.

SEE ALSO

       Commands:  cksum(1), wc(1)

       Standards:  standards(5)

																	    sum(1)

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