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I have a text file which goes like this :
125
126
127 {
566
567
568
569 # blah blah
570 { #blah blah
700
701 {
The numbers are left aligned and the pattern is always the same in the sense increasing and a curly braces at the end .I need to catch just the starting number .The braces are always found and limited to the sequence end .The start of the file is as shown starting with '125'.
In short I need :
125
566
700
What I have come up with :
grep -A1 '{' | grep -v '{' | grep -oE '(^[0-9]+?)'
but this omits '125' but I overcame by appending a newline at the head and inserting a { .
I hope to reduce this into a single regex.
Suggestions and better algorithms are welcome
998
To run a sequence file, normally I have to start the TestStand Sequence Editor application, open the sequence file, then execute the entry point. I would like to simply double-click a sequence file in Windows Explorer to launch TestStand and execute an entry point automatically in one step.
I often need to find a particular sequence in a fasta file and print it. For those who don't know, fasta is a text file format for biological sequences (DNA, proteins, etc.). It's pretty simple, you have a line with the sequence name preceded by a '>' and then all the lines following until the next '>' are the sequence itself.
Create a shortcut for the sequence file; i.e., right-click on the sequence file and select Create Shortcut from the pop-up menu. Right-click on the newly created shortcut and select Properties from the pop-up menu. Select the Shortcut tab in the Properties window that appears.
If you want to run the sequence file with the TestStand Sequence Editor replace " testexec.exe " with " SeqEdit.exe ". Create a shortcut for the sequence file; i.e., right-click on the sequence file and select Create Shortcut from the pop-up menu. Right-click on the newly created shortcut and select Properties from the pop-up menu.
awk 'BEGIN {p=1} p==1 {print $1;p=0} $0~/{/ {p=1}'
Output:
125
566
700
Given the file format above, you could use awk and a variable/flag to keep track on when you find an opening {
141
sed -n '1p;/{/{
N
s/.*\n\([0-9]\+\).*/\1/p
}' input_file
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