11-27-2001
Use "cut" to split the file into three pieces with the middle piece being the column you want to modify. Then modify it. Then use "paste" to reassemble the three pieces back to a single file.
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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)