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Top Forums Shell Programming and Scripting Parallel Runs in UNIX/Linix Shell Scripting Post 302975465 by Don Cragun on Monday 13th of June 2016 03:55:09 PM
Old 06-13-2016
I do not understand what you're trying to do.

Are you saying that you want 100 copies of split running at the same to split a single file into 100 chunks? That is not the way split works! And, the split utility takes at most two file operands; not an unlimited number as indicated by the filec... in your example split command (and the comma in filea, will be used as the base part of the names of your output files (the first four of which will be named filea,aa, filea,ab, filea,ac, and filea,ad) assuming you remove the remaining file operands which would cause split
to fail with a syntax error.

You say your input file has about 1 million records. Are the records fixed length or variable length? Are you absolutely positive that files of 2,097,152 bytes will contain complete records (i.e., that the start of a record won't be in one of your split files and the end of that record won't be at the start of the next split file)?

After you have created a bunch of files (all but the last of which contain exactly 2,097,152 bytes), what do you want to do with these files? You say you want to run them. Are each of these 2,097,152 byte files a shell script???

Does your system have 100 CPUs? If not, trying to run 100 jobs in parallel will slow down processing; not provide faster processing!

Are you going to distribute the output files from split onto different disk drives? Do you have 100 different disk drives? Will running these 100 files in parallel overwhelm your I/O subsystem?

What operating system are you using?

What shell are you using?
 

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split(1)							   User Commands							  split(1)

NAME
split - split a file into pieces SYNOPSIS
split [-linecount | -l linecount] [-a suffixlength] [ file [name]] split [ -b n | nk | nm] [-a suffixlength] [ file [name]] DESCRIPTION
The split utility reads file and writes it in linecount-line pieces into a set of output-files. The name of the first output-file is name with aa appended, and so on lexicographically, up to zz (a maximum of 676 files). The maximum length of name is 2 characters less than the maximum filename length allowed by the filesystem. See statvfs(2). If no output name is given, x is used as the default (output-files will be called xaa, xab, and so forth). OPTIONS
The following options are supported: -linecount | -l linecounNumber of lines in each piece. Defaults to 1000 lines. -a suffixlength Uses suffixlength letters to form the suffix portion of the filenames of the split file. If -a is not specified, the default suffix length is 2. If the sum of the name operand and the suffixlength option-argument would create a filename exceeding NAME_MAX bytes, an error will result; split will exit with a diagnostic message and no files will be created. -b n Splits a file into pieces n bytes in size. -b nk Splits a file into pieces n*1024 bytes in size. -b nm Splits a file into pieces n*1048576 bytes in size. OPERANDS
The following operands are supported: file The path name of the ordinary file to be split. If no input file is given or file is -, the standard input will be used. name The prefix to be used for each of the files resulting from the split operation. If no name argument is given, x will be used as the prefix of the output files. The combined length of the basename of prefix and suffixlength cannot exceed NAME_MAX bytes. See OPTIONS. USAGE
See largefile(5) for the description of the behavior of split when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes). ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of split: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ |CSI |enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
csplit(1), statvfs(2), attributes(5), environ(5), largefile(5), standards(5) SunOS 5.10 16 Apr 1999 split(1)
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