Bash - echo line by line, ignoring the space between the lines

Question

I had read the post on: bash - replace space with new line, but it does not helped to solve my issue.

   [My Directory]

[root@testlabs Config]# ls 
Archive Backup_Files
config_file.tgz
hostname1-config.uac
hostname2-config.uac
hostname3-config.uac
My-config_17Oct2014.tgz
non_extension-config_file1
non_extension-config_file2
[root@testlabs Config]#

I need to echo a list of MD5 Checksum results from a file. I am able to do so by doing this:

##IDENTIFY MD5 CHECKSUM##

 //To output the md5sum of the original file with a correct format to a temp file [md5<space><space>file_name]
ls $FULL_FILE_NAME | md5sum  $FULL_FILE_NAME > /tmp/md5sum.tmp

//To compare the md5sum of the orignal file with the md5sum of the backup copies in the archive directory
ls $CONFIG_ARCHIVE_DIR | grep -i --text $CONFIG_FILE_HOSTNAME-$FILE_TIMESTAMP.tgz | md5sum -c /tmp/md5sum.tmp >> /tmp/md5sum2.tmp

##COMPARING MD5 CHECKSUM##

 if [ -s /tmp/md5sum2.tmp ];
 then
   echo ""
   echo "Comparison of MD5 for files archived:"
   echo '---------------------------------------'
   /bin/sort -d /tmp/md5sum2.tmp
 fi

and this will be the result when it was executed: (echo of the CONTENTS in /tmp/md5sum2.tmp)

Comparison of MD5 for files archived:
---------------------------------------
 config_file.tgz: OK
 hostname1-config.uac: OK
 hostname2-config.uac: OK
 hostname3-config.uac: OK
 My-config_17Oct2014.tgz: OK
 non_extension-config_file1: OK
 non_extension-config_file1: OK

## WANTED ##

However I would like the result to be display in this way:

Comparison of MD5 for files archived:
---------------------------------------
 - config_file.tgz: OK
 - hostname1-config.uac: OK
 - hostname2-config.uac: OK
 - hostname3-config.uac: OK
 - My-config_17Oct2014.tgz: OK
 - non_extension-config_file1: OK
 - non_extension-config_file2: OK

I tried doing this, (echo the CONTENTS of /tmp/md5sum2.tmp into /tmp/md5sum3.tmp with the '-' infront)

1)

 ##COMPARING MD5 CHECKSUM##

  if [ -s /tmp/md5sum2.tmp ];
  then
  echo ""
  echo "Comparison of MD5 for files archived:"
  echo '---------------------------------------'
  /bin/sort -d /tmp/md5sum2.tmp

  for CONFIG_FILES in `/bin/cat /tmp/md5sum2.tmp`
  do
/bin/sort -d /tmp/md5sum2.tmp | grep $CONFIG_FILES > /tmp/md5sum3.tmp
  done

  for MD5_COMPARE in $(/bin/sort -d /tmp/md5sum3.tmp)
  do
   echo -e " - $MD5_COMPARE\n"
  done
 fi

Result 1)

Comparison of MD5 for files archived:
 ---------------------------------------
 - config_file.tgz:
 - OK
 - hostname1-config.uac:
 - OK
 - hostname2-config.uac:
 - OK
 - hostname3-config.uac:
 - OK
 - My-config_17Oct2014.tgz.tgz:
 - OK
 - non_extension-config_file1:
 - OK
 - non_extension-config_file2:
 - OK

2)

for MD5_COMPARE in $(/bin/sort -d /tmp/md5sum3.tmp)

  do
  echo -n " - $MD5_COMPARE"
  done

Result 2)

  Comparison of MD5 for files archived:
  ---------------------------------------
- config_file.tgz: - OK - hostname1-config.uac: - OK - hostname2-config.uac: - OK - 
  hostname3-config.uac: - OK - My-config_17Oct2014.tgz: - OK - non_extension-config_file1: -
OK - non_extension-config_file2: - OK

Hi and welcome to the site. When asking this type of question, it is essential that you also show us your input. Please [edit] your question and include the contents of `/tmp/md5sum3.tmp`. — terdon, Nov 14 '14 at 11:41
I think we may have just gotten our edits crossed. I was editing at the same time you were, please make sure I did not remove anything important. I was just removing the extra whitespace. — terdon, Nov 17 '14 at 01:19
Also, please [edit] and show us your input file. We don't know what `$FULL_FILE_NAME` or `$CONFIG_ARCHIVE_DIR` are. We also don't need to. We do need to know what the files you are comparing look like. — terdon, Nov 17 '14 at 01:21
Yes, I am adding some comments. I think Costas's solution worked out for me already :) — Win.T, Nov 17 '14 at 01:32
Cool. In that case, please remember to [accept it](http://unix.stackexchange.com/help/someone-answers). — terdon, Nov 17 '14 at 01:36

score 5 · Accepted Answer · answered Nov 14 '14 at 10:36

5

To read file line by line standard procedure is

while IFS= read -r MD5_COMPARE
do
  echo "- $MD5_COMPARE"
done < /tmp/md5sum2.tmp | /bin/sort -d

But sed should work too

/bin/sort -d /tmp/md5sum2.tmp | sed 's/^/ -/'

answered Nov 14 '14 at 10:36

Costas

14,806
20
36

This is definitely a perfect job for sed. – PM 2Ring Nov 14 '14 at 13:47
@Costas Thank you Costas /bin/sort -d /tmp/md5sum2.tmp | sed 's/^/ -/' worked for me. :) – Win.T Nov 17 '14 at 01:52

score 1 · Answer 2 · answered Nov 14 '14 at 09:04

1

Just pipe the output from sort to sed and replace one space with -:

if [ -s /tmp/md5sum2.tmp ];
then
        echo ""
        echo "Comparison of MD5 for files archived:"
        echo '---------------------------------------'
        /bin/sort -d /tmp/md5sum2.tmp | sed 's/\(^ *\) \( [^ ]\)/\1-\2/'
fi

Result:

Comparison of MD5 for files archived:
---------------------------------------
    - My-config_17Oct2014.tgz: OK
    - config_file.tgz: OK
    - hostname1-config.uac: OK
    - hostname2-config.uac: OK
    - hostname3-config.uac: OK
    - non_extension-config_file1: OK
    - non_extension-config_file1: OK

answered Nov 14 '14 at 09:04

jimmij

46,064
19
123
136

@Win.T my answer assumes that your initial file has spaces at the beginning of the line, however now I'm not sure if this is correct or your question is just wrongly formatted. – jimmij Nov 14 '14 at 09:15
The solution for /bin/sort -d /tmp/md5sum2.tmp | sed 's/$^ *$ $ [^ ]$/\1-\2/' does not worked. It returns the same result as using /bin/sort -d /tmp/md5sum2.tmp. The file /tmp/md5sum2.tmp contains the following: config_file.tgz: OK My-config_17Oct2014.tgz: OK hostname1-config.uac: OK hostname2-config.uac: OK hostname3-config.uac: OK non_extension-config_file2: OK non_extension-config_file1: OK @jimij – Win.T Nov 14 '14 at 09:54
1

@Win.T edit you question, add content of original file properly formatted. – jimmij Nov 14 '14 at 10:08
@jimij , thank you I had edited my question :) – Win.T Nov 17 '14 at 01:31

Bash - echo line by line, ignoring the space between the lines

1)

Result 1)

2)

Result 2)

2 Answers2