Shell Programming and Scripting

11:53  up  3:02, 2 users, load averages: 0,32 0,34 0,43

echo $(uptime) | sed 's/^.\+up\ \+\([^,]*\).*/\1/g'

uptime | awk '{print $3}'

uptime | awk -F, '{sub(".*up ",x,$1);print $1}'

 12:55pm  up 105 days, 21 hrs,  2 users,  load average: 0.26, 0.26, 0.26
  1:41pm  up 105 days, 21:46,  2 users,  load average: 0.28, 0.28, 0.27

>> uptime | awk -F, '{sub(".*up ",x,$1);print $1}'

# uptime
11:29:16 up 47 days, 20:34,  2 users,  load average: 0.01, 0.01, 0.00

# uptime | awk -F, '{sub(".*up ",x,$1);print $1}'
47 days

# uptime | awk -F, '{sub(".*up ",x,$1);print $1,$2}'
47 days  20:34