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Top Forums Shell Programming and Scripting Strings from one file which exactly match to the 1st column of other file and then print lines. Post 302446813 by rdcwayx on Thursday 19th of August 2010 08:16:14 PM
Old 08-19-2010
Code:
awk 'NR==FNR{a[$1]=$2;next}         # save first file "small_file.txt" into array a. column 1 as array index, column 2 as the array value. 
{print $1,a[$1]}' small_file.txt huge_file.txt    # print each line of huge_file.txt, and the related value in array a

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PR(1)									FSF								     PR(1)

NAME
pr - convert text files for printing SYNOPSIS
pr [OPTION]... [FILE]... DESCRIPTION
Paginate or columnate FILE(s) for printing. Mandatory arguments to long options are mandatory for short options too. +FIRST_PAGE[:LAST_PAGE], --pages=FIRST_PAGE[:LAST_PAGE] begin [stop] printing with page FIRST_[LAST_]PAGE -COLUMN, --columns=COLUMN output COLUMN columns and print columns down, unless -a is used. Balance number of lines in the columns on each page. -a, --across print columns across rather than down, used together with -COLUMN -c, --show-control-chars use hat notation (^G) and octal backslash notation -d, --double-space double space the output -D, --date-format=FORMAT use FORMAT for the header date -e[CHAR[WIDTH]], --expand-tabs[=CHAR[WIDTH]] expand input CHARs (TABs) to tab WIDTH (8) -F, -f, --form-feed use form feeds instead of newlines to separate pages (by a 3-line page header with -F or a 5-line header and trailer without -F) -h HEADER, --header=HEADER use a centered HEADER instead of filename in page header, -h "" prints a blank line, don't use -h"" -i[CHAR[WIDTH]], --output-tabs[=CHAR[WIDTH]] replace spaces with CHARs (TABs) to tab WIDTH (8) -J, --join-lines merge full lines, turns off -W line truncation, no column alignment, --sep-string[=STRING] sets separators -l PAGE_LENGTH, --length=PAGE_LENGTH set the page length to PAGE_LENGTH (66) lines (default number of lines of text 56, and with -F 63) -m, --merge print all files in parallel, one in each column, truncate lines, but join lines of full length with -J -n[SEP[DIGITS]], --number-lines[=SEP[DIGITS]] number lines, use DIGITS (5) digits, then SEP (TAB), default counting starts with 1st line of input file -N NUMBER, --first-line-number=NUMBER start counting with NUMBER at 1st line of first page printed (see +FIRST_PAGE) -o MARGIN, --indent=MARGIN offset each line with MARGIN (zero) spaces, do not affect -w or -W, MARGIN will be added to PAGE_WIDTH -r, --no-file-warnings omit warning when a file cannot be opened -s[CHAR],--separator[=CHAR] separate columns by a single character, default for CHAR is the <TAB> character without -w and 'no char' with -w -s[CHAR] turns off line truncation of all 3 column options (-COLUMN|-a -COLUMN|-m) except -w is set -SSTRING, --sep-string[=STRING] separate columns by STRING, without -S: Default separator <TAB> with -J and <space> otherwise (same as -S" "), no effect on column options -t, --omit-header omit page headers and trailers -T, --omit-pagination omit page headers and trailers, eliminate any pagination by form feeds set in input files -v, --show-nonprinting use octal backslash notation -w PAGE_WIDTH, --width=PAGE_WIDTH set page width to PAGE_WIDTH (72) characters for multiple text-column output only, -s[char] turns off (72) -W PAGE_WIDTH, --page-width=PAGE_WIDTH set page width to PAGE_WIDTH (72) characters always, truncate lines, except -J option is set, no interference with -S or -s --help display this help and exit --version output version information and exit -T implied by -l nn when nn <= 10 or <= 3 with -F. With no FILE, or when FILE is -, read standard input. AUTHOR
Written by Pete TerMaat and Roland Huebner. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for pr is maintained as a Texinfo manual. If the info and pr programs are properly installed at your site, the com- mand info pr should give you access to the complete manual. pr (coreutils) 4.5.3 February 2003 PR(1)
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