A very weird problem about getting a random string
Hi, guys
Here is my script and it's an imaginary script to recast a string randomly.
Code:
#!/bin/bash
# scriptname: recast_string
# purpose: recast a string randomly like this "abc123" --> "21a3cb" or "a31b2c"
function recast()
{
local original_string=$1
local changed_string=${original_string}
local recast_string=
while [[ ${i:=0} < ${#original_string} ]]
do
random_char=${changed_string:$(($RANDOM%${#changed_string})):1}
changed_string=${changed_string/$random_char/}
echo ${#changed_string}
recast_string=${recast_string}${random_char}
((i++))
done
echo "$1 has been recast to ${recast_string}."
}
recast $1
exit 0
However, I found a weird problem that if the length of string from the keyboard is less than 10, the script works well and if the length is equivalent to or greater than 10, the script works incorrectly that the loop is executed for only two times. Here is the debug results: length is 9
Code:
sh -x recast_string j138sd113
+ recast j138sd113
+ local original_string=j138sd113
+ local changed_string=j138sd113
+ local recast_string=
+ [[ 0 < 9 ]]
+ random_char=8
+ changed_string=j13sd113
+ echo 8
8
+ recast_string=8
+ (( i++ ))
+ [[ 1 < 9 ]]
+ random_char=s
+ changed_string=j13d113
+ echo 7
7
+ recast_string=8s
+ (( i++ ))
...... (omitted sth here)
+ [[ 8 < 9 ]]
+ random_char=3
+ changed_string=
+ echo 0
0
+ recast_string=8sd311j13
+ (( i++ ))
+ [[ 9 < 9 ]]
+ echo 'j138sd113 has been recast to 8sd311j13.'
j138sd113 has been recast to 8sd311j13.
length is 10
Code:
sh -x recast_string j138sd1135
+ recast j138sd1135
+ local original_string=j138sd1135
+ local changed_string=j138sd1135
+ local recast_string=
+ [[ 0 < 10 ]]
+ random_char=8
+ changed_string=j13sd1135
+ echo 9
9
+ recast_string=8
+ (( i++ ))
+ [[ 1 < 10 ]]
+ random_char=1
+ changed_string=j3sd1135
+ echo 8
8
+ recast_string=81
+ (( i++ ))
+ [[ 2 < 10 ]]
+ echo 'j138sd1135 has been recast to 81.'
j138sd1135 has been recast to 81.
I don't know why. Anybody can help me ? Appreciate that!
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LEARN ABOUT FREEBSD
tping
TPING(1) LAM COMMANDS TPING(1)NAME
tping - Send echo messages to LAM nodes.
SYNOPSIS
tping [-hv] [-c count] [-d delay] [-l length] nodes
OPTIONS -h Print the command help menu.
-v Turn OFF verbose mode.
-c count Send count messages.
-d delay Delay delay seconds between each message.
-l length Each message is length bytes long.
DESCRIPTION
The tping command sends messages to, and collects replies from, a list of nodes, via the LAM echo server. It is similar to the UNIX
ping(8) command, and is used as a quick diagnosis of the LAM network.
Unless options are specified, tping sends a 1 byte message an infinite number of times, displaying the roundtrip time of each message as it
completes, with a delay of 1 second between roundtrips. After the loop is broken (with keyboard interrupt, eg: ^C), tping prints statis-
tics about all roundtrip messages.
EXAMPLES
tping h
Echo messages to the local node.
tping -v n7 -l 1000 -c 10
Echo 1000 byte messages to node 7. Stay silent while working. Stop after 10 roundtrips and report statistics.
BUGS
There is no built-in timeout and tping will wait forever to receive an echo. If no echo is received, due to a dead link or node, tping
hangs. Stop the process with a keyboard suspend signal (eg: ^Z) and terminate LAM with lamhalt(1) or lamwipe(1) (although the use of
lamwipe(1) is deprecated).
SEE ALSO lamhalt(1), lamwipe(1)LAM 7.1.4 July, 2007 TPING(1)
06-26-2013
A very weird problem about getting a random string
