10-03-2009
awk command to separate a field
I have a log file that I am trying to convert. File contents something like this:
aaaaa bbbbbb cccc dddddd\123 eeeee ffffffff
I am trying to output the fields in a different order and separate field 4 so that the "123" and "dddddd" can be output separately. for example
bbbbbb aaaaa 123 eeeee ffffffff dddddd
The first part of field 3 changes so i cant say print character 1 to 6 of $4 etc.
And I can’t use \ as a second field separator as there are other fields containing \ in it that I want to keep as one field.
I am still new to awk and bash. Can anyone give me any hints?
Cheers.
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read(1) General Commands Manual read(1)
NAME
read - read a line from standard input
SYNOPSIS
var ...
DESCRIPTION
reads a single line from standard input. The line is split into fields as when processed by the shell (refer to shells in the first field
is assigned to the first variable var, the second field to the second variable var, and so forth. If there are more fields than there are
specified var operands, the remaining fields and their intervening separators are assigned to the last var. If there are more vars than
fields, the remaining vars are set to empty strings.
The setting of variables specified by the var operands affect the current shell execution environment.
Standard input to can be redirected from a text file.
Since affects the current shell execution environment, it is usually provided as a normal shell special (built-in) command. Thus, if it is
called in a subshell or separate utility execution environment similar to the following, it does not affect the shell variables in the
caller's environment:
Options
recognizes the following options:
Do not treat a backslash character in any special way.
Consider each backslash to be part of the input line.
Opperands
recognizes the following operands:
var The name of an existing or nonexisting shell variable.
EXTERNAL INFLUENCES
Environment Variables
determines the internal field separators used to delimit fields.
RETURN VALUE
exits with one of the following values:
0 Successful completion.
>0 End-of-file was detected or an error occurred.
EXAMPLES
Print a file with the first field of each line moved to the end of the line.
while read -r xx yy
do
printf "%s %s
" "$yy" "$xx"
done < input_file
SEE ALSO
csh(1), ksh(1), sh(1), sh-posix(1).
STANDARDS CONFORMANCE
read(1)