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Multiple beginner's problems

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# 8  
Old 02-05-2015
Using Sed

Code:
# cat file
1234 2.3
1111 4.5
2341 6.7
# sed "h;s/ .*//;y/0123456789/abcdefghij/;G;s/\n.* / /" file
abcd 2.3
aaaa 4.5
bcda 6.7

Last edited by anbu23; 02-05-2015 at 04:35 AM..
# 9  
Old 02-05-2015
Do you insist on the translation table?
Code:
awk    '       {x = ""
                 for(i = 1; i <= length($1); i++)
                 x = x sprintf ("%c", 65+ substr($1, i, 1))
                 printf("%s  %s\n", x, $2)
}' file
BBBC  2.5
CCCC  3.0
AFFF  9.0

# 10  
Old 02-05-2015
I used a translation table because the input:
Code:
0123456789abcdABCD 	 10.9

should produce the output:
Code:
ABCDEFGHIJabcdABCD  10.9

instead of the output:
Code:
ABCDEFGHIJAAAAAAAA  10.9

If we knew that the first field on each line only contains digits (no punctuation and no alphabetic characters), I would do what you did. But that wasn't specified in the problem statement and the tr command used by the submitter more closely matches what I did with the translation table.

Of course, we're both doing the wrong thing (compared to the submitter's script) if some lines have more or less than 2 fields per line. The specification provided leaves a lot unsaid. So, we all make different assumptions about what the real requirements are...
# 11  
Old 02-06-2015
I really like this method (very simple):
Code:
while read A B REST; do echo -n $A | tr '0-9' 'A-J'; echo " " $B; done < file
BBBC  2.5
CCCC  3.0
AFFF  9.0

but if my file would like like:
Code:
2121   2.0  3232   32323   1212  2122  ...(n columns)
1111   4.2  1321   12341   2123  1245  ...
  .        .      .         .          .       .
  .        .      .         .          .       .

and i would like to ,,change" column nr X from range (0-n). Example (for column nr 5) output:
Code:
2121   2.0  3232   32323   1212  CBCC  ...(n columns)
1111   4.2  1321   12341   2123  BCEF  ...
  .        .      .         .          .       .
  .        .      .         .          .       .

# 12  
Old 02-06-2015
The awk script I suggested will work with whatever field you want. Just change both occurrences of $1 in that script (which specified field #1) to $(fn) where fn is an arithmetic expression that evaluates to the number of the field you want to modify (such as $5 for the fifth field or $(NF - 1) for the next to the last field) on each line.

Note, however, that $(NF - 1) won't work if you have some lines with less than 2 fields. If you have cases like that you would have to make the change conditional on having enough fields.

PS Note that in post #11, you said you wanted to work on column nr 5, but the output you showed modified column #6; not column #5. In awk, field numbers start at 1.
Last edited by Don Cragun; 02-06-2015 at 04:01 AM.. Reason: Add PS.
# 13  
Old 02-06-2015
Why don't you adapt the solution you prefer? Try
Code:
while read A B C D E F REST; do echo -n "$A  $B  $C  $D  $E  ";  echo -n $F | tr '0-9' 'A-J'; echo " " $REST; done < file
2121  2.0  3232  32323  1212  CBCC  ...(n columns)
1111  4.2  1321  12341  2123  BCEF  ...

Might become unwieldy for fields further down the line.
# 14  
Old 02-06-2015
i know i could make it like this A B C D E ... but if my file will have 1000 columns and i will want to change column nr 500 ? If i could use ,,for loop" to avoid writing A B C D ... it would be great

PS: i guess i will have another question in the evening but first i wanna try it by myself.
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