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Full Discussion: Replacing numbers in bash scripts
Top Forums Shell Programming and Scripting Replacing numbers in bash scripts Post 302424542 by bluesmodular on Tuesday 25th of May 2010 02:35:34 PM
Old 05-25-2010
CPU & Memory Replacing numbers in bash scripts
Hi,

I have lines in some files that look exactly as below, and the line numbers they occur in are always the same. (Lines 136-139)

W 0.00000000 0.00000000 2.00000000
W 0.50000000 0.50000000 2.50000000
W 0.00000000 0.00000000 3.00000000
W 0.50000000 0.50000000 3.50000000

I'd like to replace the last number in each row for each file by numbers related to the variable $vacheight, so that the median of these 4 numbers is always half of $vacheight.

The files are all named "run_example", but are in different folders named "examples#" where # is a number from 140 to 199.

As a related example, Line 117 reads:
Code:
  celldm(3)   = 5.000,

Below is the relevant section of code that works for Line 117 and increments the number on Line 117 by 0.1 each time, in a different folder.

Code:
vacheight=`expr 4.500`
for i in */run_example; do
    printf '117s/= [^,]*/= %s/\nwq\n' "$vacheight" | ed -s "$i"
    vacheight=$(echo "scale=3; $vacheight + 0.100" | bc)
done

Thank you very much for your help!
 

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LEARN ABOUT OSF1

shblk

shblk(8)						      System Manager's Manual							  shblk(8)

NAME

       shblk - Displays disk blocks, as unformatted hexadecimal numbers

SYNOPSIS

       /sbin/advfs/shblk [-sb start_block] [-bc block_count] special

OPTIONS

       Specifies the block on which to start.  Specifies the number of blocks to display.

OPERANDS

       Specifies  the  device special file for the volume on which the block(s) are located. You can specify the volume by either its character or
       block device special file name.

	      If you are executing the command from the mount point for the volume, you must specify the character device special file, as  speci-
	      fying the block device special file produces a device busy error.

DESCRIPTION

       The  shblk  command  displays the selected blocks as hexadecimal numbers.  The blocks are not formatted to any data or metadata representa-
       tion.

       You must be the root user to use this command.

EXAMPLES

       The following example shows a user whose current file system is mounted on /dev/disk/dsk3a attempting to display block 1 of the a partition
       on that device.	Using the block device special file for the command does not work; using the character device special file does work.  The
       display is truncated on the right due to page width limitations: # /sbin/advfs/shblk -sb 1  -bc	1  /dev/disk/dsk3a  open:  Device  busy  #
       /sbin/advfs/shblk -sb 1 -bc 1 /dev/rdisk/dsk3a

       1:  47ff041f  c0200002 20009800 00000000 a7a10000 d340000a 43c4153e 4...  1: b7fe0018 47ff0411 47ff0412 d34000e8 00000000 47ff041f 2ffe0000
       4...  1: 243d0000 20218050 245d0000 204243e0 b7e10000 40211401 40410524 f...  1: 6bfa8001  47ff041f  2ffe0000  47ff041f	243dffff  23deffe0
       20217f90  b...	1:  a4410000  b53e0008	b55e0010 b57e0018 e440000b 47f00409 47e1040a 4...  1: a62a0000 47e90410 d34004ad e400000c a42a0008
       214a0008 4160300b f...  1: 201fffff a75e0000 a53e0008 a55e0010 a57e0018 23de0020 6b9a8001 2...	1:  47eb0400  c3fffff7	47ff041f  47ff041f
       23defff0  43f00011  b75e0000  4...   1:	47ff0412 47ff0413 47ff0414 47ff0415 d3400083 4807f680 a75e0000 4...  1: 40003520 23de0010 6b9a8001
       47ff041f 23defff0 b75e0000 b53e0008 4...  1: d340049f 47e00412 47e21410 47e90411 47ff0413 47ff0414  47ff0415  d...   1:	4807d689  45207009
       e5200002  201fffff  c3e00001  43e00000  a75e0000  a...  1: 23de0010 6b9a8001 47ff041f 47ff041f 23deffe0 b75e0000 b53e0008 b...  1: 47f00409
       d3400486 203f03ff 47e0040a 400107a2 4441048a e540000c 2...  1: 47e05410 47ff0411 47e90412 47e03413  47ff0414  47ff0415  d3400051  e...	1:
       4140352a 21290001 f55ffff5 a75e0000 a53e0008 a55e0010 23de0020 6...  #

SEE ALSO

       advfs(4), fs(4)

																	  shblk(8)
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