I didn't understand the "divided by 2" reason as your statement is not clear.
Probably you want to split the final output file for being too large?
From the comments, If I understood you correctly, This is what you can do..
1) create two file which contains all the "vi files" and "ci files". The the order must be sequential. i.e "June.ci" and "June.vi" must be at the same line in both the files.
2) If you are not sure about the files i.e "June.ci" is there but "june.vi" is missing, You need to handle that condition to ignore that file. (its easy)
Code:
$ ls *vi.xml
December_vi.xml July_vi.xml June_vi.xml
$
$ ls *ci.xml
December_ci.xml July_ci.xml June_ci.xml
$
$
$
$ cat proc
for i in *_vi.xml
do
echo $i >> vi_file_list
echo ${i/_vi/_ci} >> ci_file_list
done
exec 6<vi_file_list
while read -r ci
do
read -r vi <&6
echo Code to add first 30 fixed lines
echo Code to add lines after processing $ci
echo Code to add lines after processing $vi
echo Code to add last 20 fixed lines
done <ci_file_list
exec >&6-
$
$
$
$ ./proc
Code to add first 30 fixed lines
Code to add lines after processing December_ci.xml
Code to add lines after processing December_vi.xml
Code to add last 20 fixed lines
Code to add first 30 fixed lines
Code to add lines after processing July_ci.xml
Code to add lines after processing July_vi.xml
Code to add last 20 fixed lines
Code to add first 30 fixed lines
Code to add lines after processing June_ci.xml
Code to add lines after processing June_vi.xml
Code to add last 20 fixed lines
$
$
I can see it works, many thanks, only I don't understand some of the syntax in your code, may you explain me please the parts in red please?
1-)
Code:
echo ${i/_vi/_ci} # What does it mean?
2-)
Code:
exec 6<vi_file_list# What does the exec command do and 6 why?
3-)
Code:
while read -r ci # Why -r and not only r?
4-)
Code:
read -r vi <&6 # What does it mean?
5-)
Code:
exec >&6-# This is like closing the exec 6 block?, why you use "-"?
6)
Code:
./proc # I think I understand this a little bit, this is like in your first code, closign "cat" block,
only that is like executing a script because of the "./", right?
7-) Regarding the "cat proc" block, do you know how many lines can store or how is the capacity in memory before print them?
I don't understand some of the syntax in your code, may you explain me please the parts in red please?
Most of the part you will understand yourself if you think about it.
I will try to help you explaining and/or the source where you can get the help. (man pages are the easiest and best way offcourse).
Quote:
1-)
Code:
echo ${i/_vi/_ci} # What does it mean?
replacing "_vi" with "_ci" in the variable "$i". ( output to STDOUT, hence redirected to file). Check for string manipulation in bash/ksh.
Quote:
2-)
Code:
exec 6<vi_file_list# What does the exec command do and 6 why?
opening the file for reading with file descriptor 6. ( you can use any number form 3 to 9. since 0,1 and 2 are the standard descriptor used for STDIN,STDOIUT and STDERR respectively.) See IO Redirection for more details
Quote:
3-)
Code:
while read -r ci # Why -r and not only r?
Its your choice. "-r" invokes the "restricted shell". man bash and search for RESTRICTED SHELL.
Quote:
4-)
Code:
read -r vi <&6 # What does it mean?
Reading input line by line from the file (which is FD 6 now ) each line is in the variable "vi".
Quote:
5-)
Code:
exec >&6-# This is like closing the exec 6 block?, why you use "-"?
Yes. syntax for closing FD.
Quote:
6)
Code:
./proc # I think I understand this a little bit, this is like in your first code, closign "cat" block,
only that is like executing a script because of the "./", right?
"proc" is the name of the file. executing with "./". No relation with "cat".
Quote:
7-) Regarding the "cat proc" block, do you know how many lines can store or how is the capacity in memory before print them?
"cat proc" will show the contents of the file "proc" to the screen (STDOUT).
Most of the part you will understand yourself if you think about it.
I will try to help you explaining and/or the source where you can get the help. (man pages are the easiest and best way offcourse).
Hope it helps.
Many thanks anchal_khare, for sure it will help me a lot, I've read the links you suggested me and I understand many more things of your script now.
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