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On Monday 5 May 2008, 22:12, Alan McKinnon wrote: |
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> nazgul screenlets-0.0.2 # echo `uptime|grep days|sed 's/.*up |
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> \([0-9]*\) day.*/\1\/10+/'; cat /proc/cpuinfo|grep '^cpu MHz'|awk |
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> '{print $4"/30 +";}';free|grep '^Mem'|awk '{print $3"/1024/3+"}'; df |
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> -P -k -x nfs -x smbfs | grep -v '1024-blocks' | awk '{if ($1 ~ |
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> "/dev/(scsi|sd)"){ s+= $2} s+= $2;} END {print s/1024/50"/15 |
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> +70";}'`|bc|sed 's/\(.$\)/.\1cm/' 67.1cm |
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> |
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> Fascinating, most fascinating. I get 67.1cm! Longer than yours! |
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> |
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> Now, this command of your. Wazzitdo? |
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It builds a bc expression, which is then fed to bc and the result is |
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divided by 10 and has "cm" added to it. |
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uptime|grep days|sed 's/.*up \([0-9]*\) day.*/\1\/10+/' |
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This checks the uptime, and outputs "n/10+", where "n" is the uptime in |
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days. In my case, the expression is "2/10+". |
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cat /proc/cpuinfo|grep '^cpu MHz'|awk '{print $4"/30 +";}' |
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This outputs "n/30 +", where "n" is the CPU speed in mhz. In my case |
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(hyperthreding cpu) it outputs |
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3000.000/30 + |
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3000.000/30 + |
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free|grep '^Mem'|awk '{print $3"/1024/3+"}' |
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This outputs "n/1024/3+", where "n" is the "used memory" from free's |
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output. On my desktop, that is "1721716/1024/3+", but obvioulsy it |
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changes almost every time you run the command. Not sure why the used |
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memory is used instead of the total. |
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df -P -k -x nfs -x smbfs | grep -v '1024-blocks' | awk '{if ($1 |
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~ "/dev/(scsi|sd)"){ s+= $2} s+= $2;} END {print s/1024/50"/15 |
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+70";}' |
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This outputs "n/15 +70", where "n" is the sum of the 1024-blocks as per |
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df's output (excluding nfs and smbfs file systems), divided by 1024 and |
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further divided by 50. The block count of /dev/scsi* or /dev/sd* devices |
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is counted twice (not sure why though). On my system, the output |
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is "5313.33/15 +70". |
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So, the final expression fed to bc is |
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2/10+ 3000.000/30 + 3000.000/30 + 1721716/1024/3+ 5313.33/15 +70 |
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bc does the math, and sed divides the result by 10 and adds "cm" to the |
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result. For me, that gives 118.4cm. |
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It would be interesting to know why Willie chose those values, those |
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scaling factors, and what's the purpose of the constants. |
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Nice script though! Thanks! |
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-- |
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