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.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Dear All,
I would like to split a file of the following format into multiple files based on the number in the 6th column (numbers 1, 2, 3...):
ATOM 1 N GLY A 1 -3.198 27.537 -5.958 1.00 0.00 N
ATOM 2 CA GLY A 1 -2.199 28.399 -6.617 1.00 0.00 ... (3 Replies)
Discussion started by: tomasl
3 Replies
2. Shell Programming and Scripting
Hello,
What's the best way to split a large into multiple files based on the last digit in the first column.
input file:
f
2738483300000x0y03772748378831x1y13478378358383x2y23743878383802x3y33787828282820x4y43748838383881x5y5
Desired Output:
f0
3738483300000x0y03787828282820x4y4
f1... (9 Replies)
Discussion started by: alain.kazan
9 Replies
3. Shell Programming and Scripting
I am unable to spit the file based on the 2nd column passing as a parameter with awk command.
Source file:
“100”,”customer information”,”10000”
“200”,”customer information”,”50000”
“300”,”product information”,”40000”
script: the command is not allowing to pass the parameters with the awk... (7 Replies)
Discussion started by: number10
7 Replies
4. Shell Programming and Scripting
Hi,
I have a fixed width text file without any header row. One of the columns contains a date in YYYYMMDD format.
If the original file contains 3 dates, I want my shell script to split the file into 3 small files with data for each date.
I am a newbie and need help doing this. (14 Replies)
Discussion started by: bhanja_trinanja
14 Replies
5. Shell Programming and Scripting
Hi All
I have one query,say i have a requirement like the below code should be
move to diffent files whose maximum lines can be of 10 lines.Say in the below example,it consist of 14 lines.
This should be moved logically using the data in the fisrt coloumn to file1 and file 2.The data of first... (2 Replies)
Discussion started by: sarav.shan
2 Replies
6. UNIX for Dummies Questions & Answers
i have file1.txt
asdas|csada|130310|0423|A1|canberra
sdasd|sfdsf|130426|2328|A1|sydney
Expected output : on eaceh third and fourth colum, split into each two characters
asdas|csada|13|03|10|04|23|A1|canberra
sdasd|sfdsf|13|04|26|23|28|A1|sydney (10 Replies)
Discussion started by: radius
10 Replies
7. Shell Programming and Scripting
Hi,
I have a similar input format-
A_1 2
B_0 4
A_1 1
B_2 5
A_4 1
and looking to print in this output format with headers. can you suggest in awk?awk because i am doing some pattern matching from parent file to print column 1 of my input using awk already.Thanks!
letter number_of_letters... (5 Replies)
Discussion started by: prashob123
5 Replies
8. Shell Programming and Scripting
Hi All,
I have a requirement to split file into 2 sets of file. Below is a sample data of the file
AU;PTN;24EX;25-AUG-14;AU;123;SE;123;Test NN;;;;ASD;
AU;PTN;24EX;25-AUG-14;AU;456;SE;456;Test NN;;;;ASD;
AU;PTN;24EX;25-AUG-14;AU;147;SE;147;Test NN;;;;ASD;... (6 Replies)
Discussion started by: galaxy_rocky
6 Replies
9. UNIX for Beginners Questions & Answers
Hi all,
Newbie here, so please bear over with my stupid question :)
I have used far too long time today on figuring this out, so I hope that someone here can help me move on.
I have some annotation data for a transcriptome where I want to split a column containing NCBI accession IDs into a... (7 Replies)
Discussion started by: BioBing
7 Replies
10. Shell Programming and Scripting
Hi Team,
I have a requirement in such a way that need to split the file into two based on which column particular value appears.Please find my sample file below.
Lets consider the delimiter of this file as either comma or two colons.(:: and ,). So I need to split the file in such a way that all... (2 Replies)
Discussion started by: ginrkf
2 Replies
LEARN ABOUT OPENSOLARIS
fold
fold(1) User Commands fold(1)
NAME
fold - filter for folding lines
SYNOPSIS
fold [-bs] [-w width | -width] [file]...
DESCRIPTION
The fold utility is a filter that will fold lines from its input files, breaking the lines to have a maximum of width column positions (or
bytes, if the -b option is specified). Lines will be broken by the insertion of a NEWLINE character such that each output line (referred to
later in this section as a segment) is the maximum width possible that does not exceed the specified number of column positions (or bytes).
A line will not be broken in the middle of a character. The behavior is undefined if width is less than the number of columns any single
character in the input would occupy.
If the CARRIAGE-RETURN, BACKSPACE, or TAB characters are encountered in the input, and the -b option is not specified, they will be treated
specially:
BACKSPACE The current count of line width will be decremented by one, although the count never will become negative. fold will
not insert a NEWLINE character immediately before or after any BACKSPACE character.
CARRIAGE-RETURN The current count of line width will be set to 0. fold will not insert a NEWLINE character immediately before or after
any CARRIAGE-RETURN character.
TAB Each TAB character encountered will advance the column position pointer to the next tab stop. Tab stops will be at each
column position n such that n modulo 8 equals 1.
OPTIONS
The following options are supported:
-b Counts width in bytes rather than column positions.
-s If a segment of a line contains a blank character within the first width column positions (or bytes), breaks the line
after the last such blank character meeting the width constraints. If there is no blank character meeting the require-
ments, the -s option will have no effect for that output segment of the input line.
-w width|-width Specifies the maximum line length, in column positions (or bytes if -b is specified). If width is not a positive deci-
mal number, an error is returned. The default value is 80.
OPERANDS
The following operand is supported:
file A path name of a text file to be folded. If no file operands are specified, the standard input will be used.
EXAMPLES
Example 1 Submitting a file of possibly long lines to the line printer
An example invocation that submits a file of possibly long lines to the line printer (under the assumption that the user knows the line
width of the printer to be assigned by lp(1)):
example% fold -w 132 bigfile | lp
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of fold: LANG, LC_ALL, LC_CTYPE, LC_MES-
SAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 All input files were processed successfully.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|CSI |enabled |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
cut(1), pr(1), attributes(5), environ(5), standards(5)
NOTES
fold and cut(1) can be used to create text files out of files with arbitrary line lengths. fold should be used when the contents of long
lines need to be kept contiguous. cut should be used when the number of lines (or records) needs to remain constant.
fold is frequently used to send text files to line printers that truncate, rather than fold, lines wider than the printer is able to print
(usually 80 or 132 column positions).
fold may not work correctly if underlining is present.
SunOS 5.11 1 Feb 1995 fold(1)