I have a file which contains so many lines and variable
number of lines are treated as a record. For example
*first ooooo xxxxx
ttttt mmmm vvvvvvv
*end uuu bbbb
*first kkkkvvvvvv
nnnn mmmmm kkkkk
fffff gggg ffff
kkkk
lllll
*end.
Here the lines from *first to *end are treated as a record.
The number of lines between *first and *end is not same for
all the records.
Suppose there are 100 records (or number of records are not
predefined)like the format given in the above example. Now
the entire file needs to split into two files, first having
40 and remaining in the second file.
Can we split using sort utility? If possible then what is
the sort card?
Answer / Shaji Najeev Siddiki
The `sort` utility can be used to sort lines in a file, but it is not suitable for splitting files into multiple parts based on records with variable numbers of lines. To achieve this, you can use a scripting language such as bash, Python, or Perl. Here's an example using bash:
```bash
awk '/^*first/{start=1; next}/^*end/{end=1; if (start) { print > "file1"; start=0 }}{print > "file2"}' file.txt
```
This script uses the `awk` command to process each line of the input file (`file.txt`) and check for lines that start with `*first` or `*end`. When a `*first` line is found, it starts recording lines in the first output file (`file1`). When a `*end` line is found, it stops recording lines and moves on to the second output file (`file2`). Note that this example assumes that there are no nested records (i.e., records within other records) and that each record has at least one line between `*first` and `*end`.
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