I'm doing some web development and I am printing out some object data in the console. I want to target one property/field denoted in output as dataURI: DFASDFKAJELKJDFSADFMLAKFJLSKDJFAJSDFL which is a super long string, and shorten it then append with ellipses at say 25 characters. Is there a .bashrc script or command for this? I don't want to get ellipses on entire output, just the dataURI field.

  • Your not telling how your printing that data in the console, but assuming that it's a file, perl -pe 's/\b(dataURI:\ s*)(\S{11})\S{3,}(\S{11})/$1$2...$3/g'
    – mosvy
    Apr 6 '20 at 17:42
  • My web application is printing this object from javascript, when certain actions trigger. But I wanted to catch them with bash script rather then change the javascript console.log(). Apr 6 '20 at 17:48
  • Or shorter, and doing actually 25 instead of 24 characters: ... input .. | perl -pe 's/\bdataURI:\s*\S{11}\K\S{4,}(?=\S{11})/.../g'. You can call that from a bash script. Doing string processing in bash is actually not a good idea, so unless you're already having that data in a bash variable, don't get it there with a while IFS= read -r var; do ...; done in the 1st place ;-)
    – mosvy
    Apr 6 '20 at 17:54
  • Oh ok I'll trust you then that it's not a good idea then, I'll find a workaround in javascript, thank you! Apr 6 '20 at 17:57
  • FWIW, my first substitution works exactly the same in javascript as in perl: your_string.replace(/\b(dataURI:\ s*)(\S{11})\S{4,}(\S{11})/g, "$1$2..$3")
    – mosvy
    Apr 6 '20 at 18:07

You could use


Or you can use parameter expansion:

echo "${yourvar:0:25}..."

Though with both of these if your string is shorter than 25 characters it'll still include the ellipsis.

  • It is printing from web application using javascript console.log(). Apr 6 '20 at 17:50
  • 3
    @ArielFrischer ... then why in the world is this tagged bash, shell, and shell-script?
    – Shawn
    Apr 6 '20 at 17:52
  • Because I wanted to catch it with bash script, and do it selectively for different fields. The output is in my bash terminal. Apr 6 '20 at 17:54

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