01-09-2009
count number of nonempty columns in row
Hi,
Suppose i have a inputfile in csv format.
How to use awk to count 'the number of nonempty columns in each row' minus one, and add the value as a new column in the end
For cosmetic reason, it's even better to include a descriptive label for the last column in the first row.
for example, i want to convert
London,a,b,c,,,,->London,a,b,c,,,,,3
York,a,b,,,a,a ->York,a,b,,,a,a,4
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Input
A.1 Q.1
A.1 Q.2
A.1 Q.3
A.2 Q.4
Explanation:
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A.1 Q.2 s1 t2
A.1 Q.3 s1 t3
A.2 Q.4 s5 t5
---------- Post updated 09-28-12 at 03:38 AM ---------- Previous update was 09-27-12 at 09:10 AM ----------
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COLRM(1) BSD General Commands Manual COLRM(1)
NAME
colrm -- remove columns from a file
SYNOPSIS
colrm [start [stop]]
DESCRIPTION
The colrm utility removes selected columns from the lines of a file. A column is defined as a single character in a line. Input is read
from the standard input. Output is written to the standard output.
If only the start column is specified, columns numbered less than the start column will be written. If both start and stop columns are spec-
ified, columns numbered less than the start column or greater than the stop column will be written. Column numbering starts with one, not
zero.
Tab characters increment the column count to the next multiple of eight. Backspace characters decrement the column count by one.
ENVIRONMENT
The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7).
EXIT STATUS
The colrm utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
awk(1), column(1), cut(1), paste(1)
HISTORY
The colrm command appeared in 3.0BSD.
BSD
August 4, 2004 BSD