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SED: Update Last Line with Number Lines in File

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# 1  
Old 01-07-2008
SED: Update Last Line with Number Lines in File
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
# 2  
Old 01-07-2008
Code:
nawk '{
    if (NR != 1)
       print lstln
    lstln = $0
} END { printf("%05d\n", NR) }' file

# 3  
Old 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

Last edited by radoulov; 01-07-2008 at 06:33 PM.. Reason: As always: use nawk or /usr/xpg4/bin/awk on Solaris :)
# 4  
Old 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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