root@salt01:~# salt 'scale*' cmd.run 'cat /etc/example'

scale-gw.mv.tsgdc.io:
    Variable is: custom-var-data
    a
    b
    c
    d
    e
    f
    g
root@salt01:~#
root@salt01:~# salt 'scale*' file.line /etc/example 'blah blah blah', after='b', mode='ensure'
scale-gw.mv.tsgdc.io:
    ERROR: Found less than expected occurrences in "after" expression