Gfilui

I am saving the output of terminal by 2>&1 | tee ./
results.txt in a .txt file which has the following text:

executing: ./home/images/image-001-041.png
0,33, /results/image-001-041.png
1.7828,32, /results/image-001-040.png
1.86051,34, /results/image-001-042.png
1.90462,31, /results/image-001-039.png
1.90954,30, /results/image-001-038.png
1.91953,35, /results/image-001-043.png
1.92677,28, /results/image-001-036.png
1.92723,3160, /results/image-037-035.png
1.93353,7450, /results/image-086-035.png
1.93375,1600, /results/image-019-044.png

I need to take the second numbers (after first comma sign, i.e. 33,32,34,...) and save it in a list in Python. What is the bash command, or the regular expression command in python?
Thanks

Using cut:

cut -sd',' -f2 < result.txt

from man cut:

-d, --delimiter=DELIM
 use DELIM instead of TAB for field delimiter
-s, --only-delimited
 do not print lines not containing delimiters
-f, --fields=LIST
 select only these fields; also print any line that contains
 no delimiter character, unless the -s option is specified

You could use awk

awk -F ',' 'print $2' results.txt

Define a comma as the field separator and print the second column.

Example with sed

$ sed -rn 's/[^,]+,([^,]+),.*/1/p' results.txt
33
32
34
31
30
35
28
3160
7450
1600

Notes

• 
  -n don't print anything until we ask for it (removes non-matching lines)


• 
  -r use ERE (so we don't need backslashes for + and ( ) metacharacters)


• 
  [^,]+, some non-commas followed by a comma


• 
  ([^,]+), save some non-commas followed by a comma for later (we only want this part)


• 
  .* any number of any characters (gets rid of the rest of the line)


• 
  1 the pattern we saved


• 
  p print the lines we changed (needed with -n)

Since you mention Python:

with open('results.txt') as results:
 ids = [int(line.split(',')[1]) for line in results if ',' in line]
 print(ids)

It creates a list of integers as ids, and displays it:

[33, 32, 34, 31, 30, 35, 28, 3160, 7450, 1600]

You can use Perl which is similar to the awk and sed solutions posted.

-a enables automatic splitting on each line.

-F is used to specify the delimiter to split each line. It defaults to ' '. Then the result is stored in @F. Hence $F[1] gives us the second column.

-l makes sure a newline is added to each line.

-e is used to specify the command we need to execute on each line which is print

$ perl -F, -ale 'print $F[1]' results.txt
33
32
34
31
30
35
28
3160
7450
1600

The above expands to the below program :

$ perl -MO=Deparse -F, -ale 'print $F[1]' results.txt
BEGIN $/ = "n"; $ = "n"; 
LINE: while (defined($_ = readline ARGV)) 
 chomp $_;
 our @F = split(/,/, $_, 0);
 print $F[1];

-e syntax OK