printing a substring in a bash script

Question

I have a string :

baseline=RAVENPLAT1.5.5.0_1.5.5.0-318_CHASSIS_PKG_193_15-AUG-2014_0350@/vobs/tlv_pvob

I'm trying to get into a variable the subtring untill the '@' sign is it possible?

Answer 1

Use Parameter Expansion:

$ baseline=RAVENPLAT1.5.5.0_1.5.5.0-318_CHASSIS_PKG_193_15-AUG-2014_0350@/vobs/tlv_pvob
$ echo "${baseline%%@*}"
RAVENPLAT1.5.5.0_1.5.5.0-318_CHASSIS_PKG_193_15-AUG-2014_0350

Answer 2

Using BASH regex:

baseline=RAVENPLAT1.5.5.0_1.5.5.0-318_CHASSIS_PKG_193_15-AUG-2014_0350@/vobs/tlv_pvob

[[ "$baseline" =~ ^([^@]+) ]] && myvar="${BASH_REMATCH[1]}"

echo "$myvar"
RAVENPLAT1.5.5.0_1.5.5.0-318_CHASSIS_PKG_193_15-AUG-2014_0350

OR else using BASH string manipulations:

myvar="${baseline%%@*}"