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Old 09-05-2008, 01:55 PM   #1
quadmore
LQ Newbie
 
Registered: May 2004
Location: Ottawa, Ontario, Canada
Distribution: Redhat 9
Posts: 20

Rep: Reputation: 0
(Korn Shell/POSIX) want to make sure last character in line is a space


Hello,

Am on HP UX 11i3, I want to make sure a sensitive file always has a space at the end of each line, seems so simple and yet...


#!/bin/ksh

TEMP_FILE="./test.txt"

# I am interested in the space character just before the closing quote :
echo "123 " >> ${TEMP_FILE}
echo "1234 " >> ${TEMP_FILE}
echo "1235 " >> ${TEMP_FILE}

# I tried this :
while read line
do
echo "...${line#${line%?}}..."
done < ${TEMP_FILE}

## RESULT, expected "... ..." for each line :
#...3...
#...4...
#...5...

# I tried that :
while read line
do
echo "${line}" | sed -e 's/\(^.*\)\(.$\)/\2/'
done < ${TEMP_FILE}

## SAME RESULT :
#...3...
#...4...
#...5...

rm -f ${TEMP_FILE}
exit $?


Any help greatly appreciated?

Thanks much,
Bert
 
Old 09-05-2008, 02:21 PM   #2
jim mcnamara
Member
 
Registered: May 2002
Posts: 964

Rep: Reputation: 34
If you read a record from the file you have to set IFS="\n". This reads records from a file maintaining the trailing space

Code:
#!/bin/ksh

while IFS='\n';read record
do
     
     echo "$record" | grep -q ' $' ||  printf "bad :%s:\n" "$record"
    
done < infile
IFS=" "
infile:
Quote:
this line has a trailing space
this line does not
output:
Quote:
csadev:/home/jmcnama> t.sh
bad :this line does not:
 
Old 09-08-2008, 10:57 AM   #3
quadmore
LQ Newbie
 
Registered: May 2004
Location: Ottawa, Ontario, Canada
Distribution: Redhat 9
Posts: 20

Original Poster
Rep: Reputation: 0
Thanks!

Superb,

That works perfectly. Learned something new today.

Thanks again
Bert
 
  


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