MISC

Bash_tipsNtricks

### Howto capture regexp group and print it 
ll -1
em110msp_1.0.13-10_release-unsigned.apk
em110msp_1.0.13-10_release-unsigned.json

# daniel@mcs-Ubuntu:
ls -1 | pcregrep -o2 "(.*)_(.*)_(.*)(.apk|.pom|.json)$"
1.0.13-10
1.0.13-10
### -o, --only-matching=n        show only the part (#group) of the line that matched


### To list all users in 'sudo' and 'adm' group                                                                                  for usr in `sudo cat /etc/passwd | awk -F':' '{print $1}'`; do id $usr; done | grep sudo | grep -e "(adm)"
for usr in `sudo cat /etc/passwd | awk -F':' '{print $1}'`; do id $usr; done | grep sudo | grep -e "(adm)"

### To remove a user from sudo group
sudo deluser $usr sudo