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How do I grab only the number from a command line output.

For example, I have a program which on being run outputs a string like

submitted batch with job number 12345

I would like to grab only the number 12345 and pipe it to another program.

2

The simplest form to get only the number from the string you have provided is as follows.

string="submitted batch with job number 12345"
echo $string | grep -o '[0-9]\+'

This will fail if the string or output of your program does include a second number group like

string="submitted 1 batch with job number 12345"

In that case, you would could use sed to e.g. search for the string number and only match for numbers after that occurrence.

echo $string | sed -n 's/^.*number\ \([0-9]\+\)/\1/p'
  • Thanks! I'm not able to accept the answer due to my rating but this works wonderful! – Adi279 Oct 10 '17 at 18:53
  • We can use | tail -1 to cut only the last result, if there are more than one. – pa4080 Oct 10 '17 at 18:54
  • Save the pipe subshell with a here string, e.g. grep -o '[0-9]\+' <<< "$string". – dessert Oct 10 '17 at 20:28
  • No need to specify the beginning of the line and to escape the space character in quotes – and no need to negate and print it: sed 's/.*number \([0-9]\+\)/\1/' <<< "$string" – dessert Oct 10 '17 at 20:37

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