sed variable expansion fails for substitution in range

Shell Programming and Scripting
1

I'm trying to change "F" to "G" in lines after the first one:

'FUE.SER' 5
 1  1             F0501 F0401 F0502
 2  1       F0301 E0501 F0201 E0502 F0302
 3  1 F0503 E0503 E0301 E0201 E0302 E0504 F0504
 4  1 F0402 F0202 E0202 F0101 E0203 F0203 F0403
 5  1 F0505 E0505 E0303 E0204 E0304 E0506 F0506
 6  1       F0303 E0507 F0204 E0508 F0304
 7  1             F0507 F0404 F0508
 0  0

This is the desired end state:

'FUE.SER' 5
 1  1             G0501 G0401 G0502
 2  1       G0301 E0501 G0201 E0502 G0302
 3  1 G0503 E0503 E0301 E0201 E0302 E0504 G0504
 4  1 G0402 G0202 E0202 G0101 E0203 G0203 G0403
 5  1 G0505 E0505 E0303 E0204 E0304 E0506 G0506
 6  1       G0303 E0507 G0204 E0508 G0304
 7  1             G0507 G0404 G0508
 0  0

Here's the script:

#!/bin/sh -xv
AAA=G
sed -e '/FUE\.SER/,/0  0/ {/FUE\.SER/b; s/F/'$AAA'/g;}'

Here's the output:

'FUE.SER' 5
0502 G            G
0302 E0502 GG
0504 E0503 E0301 E0201 E0302 E0504 G
0403 G0203 G
0506 E0505 E0303 E0204 E0304 E0506 G
0304 E0508 GG
0508 G            G
 0  0

I've tried several different quote schemes but can't seem to get $AAA to substitute correctly. Anyone have any suggestions?
Thanks,
Larry

2

Like this?

AAA=G
sed "2,$ s/F/$AAA/g" infile

--ahamed

3

Hi ahamed,
Yes, like that. But the range is in the middle of a file of hundreds of lines. So, I need the range construction.

/FUE\.SER/,/0  0/

And, I don't want to modify the line

'FUE.SER' 5

Eventually, I want to increment the AAA variable. So, I want to pass that variable to the sed substitution. But, I can't seem to get the behavior that I want.
Thanks,
Larry

4

I didn't quite understand about incrementing the AAA variable. May be you should provide more input with desired output.

This has the range in place.

AAA=G
sed "/'FUE.SER' 5/,/ 0  0/ {/FUE.SER/{n}; s/F/$AAA/g}" infile

--ahamed

5

when I try your suggestion, I get the result:

'FUE.SER' 5
0502 G            G
0302 E0502 GG
0504 E0503 E0301 E0201 E0302 E0504 G
0403 G0203 G
0506 E0505 E0303 E0204 E0304 E0506 G
0304 E0508 GG
0508 G            G
 0  0

As for incrementing, the goal is to increment AAA each cycle. Initially it is 'F'. Next I want to to increment it to 'G', next time to 'H',the 'I', etc. Does that help?

6

this is what I get

root@maximus:/tmp# AAA=G
root@maximus:/tmp# sed "/'FUE.SER' 5/,/ 0  0/ {/FUE.SER/{n}; s/F/$AAA/g}" infile
'FUE.SER' 5
 1  1             G0501 G0401 G0502
 2  1       G0301 E0501 G0201 E0502 G0302
 3  1 G0503 E0503 E0301 E0201 E0302 E0504 G0504
 4  1 G0402 G0202 E0202 G0101 E0203 G0203 G0403
 5  1 G0505 E0505 E0303 E0204 E0304 E0506 G0506
 6  1       G0303 E0507 G0204 E0508 G0304
 7  1             G0507 G0404 G0508
 0  0

--ahamed

---------- Post updated at 10:31 PM ---------- Previous update was at 10:29 PM ----------

Which is your OS? Paste the exact command you are using, copy paste it please.

--ahamed

7

The commands are in a file called 't3'. Here's the contents:

#!/bin/sh -xv
AAA=G
sed "/'FUE.SER' 5/,/ 0  0/ {/FUE.SER/{n}; s/F/$AAA/g}"

I invoke it like this:

./t3 <input

I'm running Cygwin64 in Windows 7. Could that be my problem?

8

Can you paste the output of the script you execute? I don't see any issue with that.

Try this from the command line and see if it works

awk '/.FUE.SER. 5/,/ 0  0/{if(!/FUE.SER/){gsub(/F/,AAA)} }1' AAA=G infile

--ahamed

9

That works perfectly. How do I incorporate that into a working script?

---------- Post updated at 02:21 AM ---------- Previous update was at 02:14 AM ----------

Here's the output of the script I ran:

$ ./t3.txt <inp.txt
#!/bin/sh -xv
AAA=G
+ AAA=$'G\r'
sed "/'FUE.SER' 5/,/ 0  0/ {/FUE.SER/{n}; s/F/$AAA/g}"
/g}'d '/'\''FUE.SER'\'' 5/,/ 0  0/ {/FUE.SER/{n}; s/F/G
'FUE.SER' 5
0502 G            G
0302 E0502 GG
0504 E0503 E0301 E0201 E0302 E0504 G
0403 G0203 G
0506 E0505 E0303 E0204 E0304 E0506 G
0304 E0508 GG
0508 G            G
 0  0
10

There's your problem, the \r in AAA assignment. Delete the line from the script and type it in manually - do not copy paste or do anything of that sort.

BTW
You can just relace the sed statement with the awk in your script omitting the file name infile.

--ahamed

11

Many thanks, ahamed! I appreciate your sticking with me to find the real problem. Your patience is apreciated..:b: