updating the version number after the deploy, by editing the deploy script

self-updating-version.sh

#!/bin/sh

# do something with a version number, and then increment the version number in this script.
# Is this a good idea? No claims made.

set -e # exit on fail
set -x # print what you're doing

me=$0 # name of this script

VERSION_NUMBER=5

## Do stuff with the version number
echo "I am $me, with version number $VERSION_NUMBER"

## Now change this script to increment the version number, so next time it will be different.
function sed_in_place {
  expr=$1
  file=$2
  backup=$file.bak
  sed "$expr" $file > $file.bak
  chmod `stat -f %A $file` $file.bak # this works on mac, to copy file permissions.
  mv $file.bak $file
}

sed_in_place "s/VERSION_NUMBER=$VERSION_NUMBER/VERSION_NUMBER=$(( VERSION_NUMBER + 1 ))/" $me

Came here from your blog to ask: Is there a particular reason against using sed --in-place? 🤔

wouldn't that be lovely? 😢
The version of sed on my mac doesn't have it. Same with chmod --reference