bash arithmetic - Revision history

Jmtizzle at 02:17, 2 January 2015

2015-01-02T02:17:12Z

2013-08-23T17:04:19Z

2013-04-27T04:17:18Z

Created page with "examples a=`expr $a + 1` a=`expr 5 + 3` category:bash"

New page

examples
a=`expr $a + 1`

a=`expr 5 + 3`

[[category:bash]]

← Older revision		Revision as of 02:17, 2 January 2015
Line 22:		Line 22:

	a=`expr 5 + 3`		a=`expr 5 + 3`
		+
		+	== bash built in hex 2 dec ==
		+	'''hex digits ab a1 48 39'''
		+
		+	$ echo $((0xab))
		+	171
		+	$ echo -e $((0xab)) $((0xa1)) $((0x48)) $((0x39))
		+	171 161 72 57
		+
		+	'''hex to dotted quad IP notation'''
		+
		+	$ echo 'aba14839' \|sed 's/../ 0x&/g' \|xargs printf "%d.%d.%d.%d\n"
		+	171.161.72.57
		+
		+

	[[category:bash]]		[[category:bash]]

← Older revision		Revision as of 17:04, 23 August 2013
Line 1:		Line 1:
−	~~examples~~	+
		+	== using let ==
		+
		+	let "TOTAL = ( $A + 5 ) / $b"
		+
		+
		+	== floating point using bc ==
		+
		+	TOTAL=`echo "( $A + 5 ) / $b" \| bc -l
		+
		+	'''using scale to control number of digits'''
		+
		+	$ echo "1 / 100" \| bc -l
		+	.01000000000000000000
		+
		+	$ echo "scale =2; 1 / 100" \| bc -l ~
		+	.01
		+
		+
		+	using expr
	a=`expr $a + 1`		a=`expr $a + 1`