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Top Forums Shell Programming and Scripting Split the file based on column Post 302756929 by Don Cragun on Wednesday 16th of January 2013 05:41:44 PM
Old 01-16-2013
Any utility specified to read text files (including awk, grep, read, and sed) may fail on any line longer than LINE_MAX bytes long. The value of LINE_MAX on your system can be found by running the command: getconf LINE_MAX. The cut, paste, and fold utilities, however, are required to work with text files with unlimited line lengths. So, a way to do this is to:
1. Use cut to create a file just containing field 2 from your intput file into a file (e.g., name_list).
2. Use cut to create a file with the first LINE_MAX-5 bytes from of your input file into a file (e.g., part001).
3. Use cut to create other files with sequential sets of LINE_MAX-5 bytes from your input file (e.g., part002 ... partXXX) such that every of part of your input file has been split into a file with lines less than LINE_MAX bytes long.
4. Read name_list and calculate the name of the file to contain the reassembled input line.
5. Read a line from each of the partXXX files and write it to the appropriate output file. (Note that the writes may have to be done as a separate write for each partXXX file line adding a trailing newline character to the write of the last partXXX file.) You could also create separate output_field2_partXXX files, and use paste to create the final output files from these intermediate files.
 

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PASTE(1)						    BSD General Commands Manual 						  PASTE(1)

NAME
paste -- merge corresponding or subsequent lines of files SYNOPSIS
paste [-s] [-d list] file ... DESCRIPTION
The paste utility concatenates the corresponding lines of the given input files, replacing all but the last file's newline characters with a single tab character, and writes the resulting lines to standard output. If end-of-file is reached on an input file while other input files still contain data, the file is treated as if it were an endless source of empty lines. The options are as follows: -d list Use one or more of the provided characters to replace the newline characters instead of the default tab. The characters in list are used circularly, i.e., when list is exhausted the first character from list is reused. This continues until a line from the last input file (in default operation) or the last line in each file (using the -s option) is displayed, at which time paste begins selecting characters from the beginning of list again. The following special characters can also be used in list: newline character tab character \ backslash character Empty string (not a null character). Any other character preceded by a backslash is equivalent to the character itself. -s Concatenate all of the lines of each separate input file in command line order. The newline character of every line except the last line in each input file is replaced with the tab character, unless otherwise specified by the -d option. If '-' is specified for one or more of the input files, the standard input is used; standard input is read one line at a time, circularly, for each instance of '-'. EXIT STATUS
The paste utility exits 0 on success, and >0 if an error occurs. EXAMPLES
List the files in the current directory in three columns: ls | paste - - - Combine pairs of lines from a file into single lines: paste -s -d ' ' myfile Number the lines in a file, similar to nl(1): sed = myfile | paste -s -d ' ' - - Create a colon-separated list of directories named bin, suitable for use in the PATH environment variable: find / -name bin -type d | paste -s -d : - SEE ALSO
cut(1), lam(1) STANDARDS
The paste utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. HISTORY
A paste command appeared in Version 32V AT&T UNIX. BSD
June 25, 2004 BSD
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