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sed - script

Posted on 2013-01-24
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Last Modified: 2013-02-11
I am trying to understand these line. Can some one explain as i am new to scripting.


egrep 'PASS|FAIL' $LOGFILE | wc -l | sed 's/^ *//;s/ *$//'

grep PASS $LOGFILE | wc -l | sed 's/^ *//;s/ *$//'

grep FAIL $LOGFILE | wc -l | sed 's/^ *//;s/ *$//'

echo $SCAN_PASS/$SCAN_TOTAL*100 | bc -l | awk -F. '{print $1}'| sed 's/^ *//;s/ *$//'
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Question by:ittechlab
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6 Comments
 

Author Comment

by:ittechlab
ID: 38814808
what is this mean?

sed 's/^ *//;s/ *$//'
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LVL 68

Expert Comment

by:woolmilkporc
ID: 38814824
This removes empty lines as well as lines containing only spaces.
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LVL 19

Assisted Solution

by:simon3270
simon3270 earned 420 total points
ID: 38814859
The 's/^ *//' removes all leading spaces.  The 's/ *$//' removds all trailing spaces.  SO, for example, the result of the first egrep line is the number of PASS or FAIL lines in the LOGFILE, with no spaces aound the number.
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Author Comment

by:ittechlab
ID: 38814917
Thanks


$SCAN_PASS=10
$SCAN_TOTAL=20

can you please advise what is this line does. do we need bc -l?

$SCAN_PASS/$SCAN_TOTAL*100 | bc -l | awk -F. '{print $1}'| sed 's/^ *//;s/ *$//'
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Author Comment

by:ittechlab
ID: 38815561
sorry.

SCAN_PASS=10
SCAN_TOTAL=20

not

$SCAN_PASS=10
$SCAN_TOTAL=20
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LVL 19

Accepted Solution

by:
simon3270 earned 420 total points
ID: 38817765
"bc" is the "Basic Calculator".  What you are doing is feeding the calculation $SCAN_PASS divided by $SCAN_TOTAL multiplied by 100 into bc - this gives the percentage of successful scans out of the total.  (you need an "echo" at the start of the line).

The result of your calculation is 10/20*100 = 50.00000000
The "awk" command then splits input on the decimal point, and prints out the bit before the decimal.  The sed at the end removes the leading and trailing spaces.

One thing I woudl add to this is to put double-quotes round the SCAN_PASS/SCAN_TOTAL*100 bit.

There are other was of doing this - you could get awk to do the calculation, and to print out only the integer part, and remove (actually, not include) the spaces.
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