I am in the process of writing a simple script to grab battery information from acpi so I can format and output it.
Currently, I am using cut to grab this information, but as the battery state changes, cut does not grab the correct data and instead will grab a portion of a string instead of the battery percentage.
When running acpi -b, I get the following output:
Battery 0: Unknown, 100
Occasionally, acpi -b will also return the following, or something similar if it is charging or discharging:
Battery 0: Discharging, 98%, 02:14:14 remaining
So, without using cut, I’d like to be able to grab the data after the first comma, and, on occasion when present, grab the information between both commas. Right now, I am using sed to strip whitespace and the percentage sign from the output. Here is that command:
acpi -b | cut -c20-24 | sed 's/ //g;s/%//g'
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Answer
You can use use this simple awk command:
s='Battery 0: Unknown, 100'
awk -F',[[:blank:]]*' '{sub(/%/, "", $2); print $2}' <<< "$s"
100
s='Battery 0: Discharging, 98%, 02:14:14 remaining'
awk -F',[[:blank:]]*' '{sub(/%/, "", $2); print $2}' <<< "$s"
98
awk breakup:
-F,[[:blank:]]* # makes comma followed by 0 or more spaces as field separator sub(/%/, "", $2) # remove trailing % print $2 # print 2nd field