SED: Update Last Line with Number Lines in File - Shell Programming and Scripting

bmkux · #1 01-07-2008

Hi,

I have to update last line of a text file with the number of lines in that file. This last line will have text such as 0.0000 and I should replace this with number lines. If lines are 20 then it should be replaced with 00020. Any sed or awk cmd help would be appreciated

shamrock · #2 01-07-2008

Code:

nawk '{
    if (NR != 1)
       print lstln
    lstln = $0
} END { printf("%05d\n", NR) }' file

radoulov · #3 01-07-2008

Another one:

Code:

awk 'x=$0||!NF;END{printf "%05d\n", NR}'  data

But I believe you don't want to count the last line:

Code:

awk 'x=$0||!NF;END{printf "%05d\n", --NR}'  data

ghostdog74 · #4 01-07-2008

with coreutils head command and bash

Code:

numlines=`wc -l file|cut -f1 -d" "`
head -n-1 file > newfile
printf "%05d" $(( numlines-1 )) >> newfile

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