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Top Forums Shell Programming and Scripting Inserting a line when its length is variable Post 302361030 by jp2542a on Monday 12th of October 2009 02:31:13 AM
Old 10-12-2009
Your definition is not very clear and test data very limited , but try this:

Code:
awk '(NR==FNR) {A=$1} (NR!=FNR) & (FNR != 28) {FS=","; print;} (NR!=FNR) & (FNR==28) { $2 = A/3 + 1; $NF=A; print}'  file1 file2

where file1 is the first file with the last line of interest and file 2 is the file with the line you want to replace.
 
Test Your Knowledge in Computers #914
Difficulty: Medium
In bash, grep -v -e '^[[:space:]]*$' file.txt will filter all the blank lines from file.txt and save the results in a file called file.txt.
True or False?

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JOIN(1) 						      General Commands Manual							   JOIN(1)

NAME
join - relational database operator SYNOPSIS
join [ options ] file1 file2 DESCRIPTION
Join forms, on the standard output, a join of the two relations specified by the lines of file1 and file2. If file1 is `-', the standard input is used. File1 and file2 must be sorted in increasing ASCII collating sequence on the fields on which they are to be joined, normally the first in each line. There is one line in the output for each pair of lines in file1 and file2 that have identical join fields. The output line normally con- sists of the common field, then the rest of the line from file1, then the rest of the line from file2. Fields are normally separated by blank, tab or newline. In this case, multiple separators count as one, and leading separators are dis- carded. These options are recognized: -an In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2. -e s Replace empty output fields by string s. -jn m Join on the mth field of file n. If n is missing, use the mth field in each file. -o list Each output line comprises the fields specifed in list, each element of which has the form n.m, where n is a file number and m is a field number. -tc Use character c as a separator (tab character). Every appearance of c in a line is significant. SEE ALSO
sort(1), comm(1), awk(1) BUGS
With default field separation, the collating sequence is that of sort -b; with -t, the sequence is that of a plain sort. The conventions of join, sort, comm, uniq, look and awk(1) are wildly incongruous. JOIN(1)

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