Visit Our UNIX and Linux User Community


passing letters from an array into a string for string comparison


 
Thread Tools Search this Thread
Homework and Emergencies Homework & Coursework Questions passing letters from an array into a string for string comparison
# 1  
Old 02-28-2012
passing letters from an array into a string for string comparison

attempting the hangman program. This was an optional assignment from the professor. I have completed the logical coding, debugging now.

##I have an array $wordString[] that initializes to a string of dashes
##reflecting the number of letters in $theWord
##every time the user enters a (valid) letter this function is called and $letter is passed to it as $1
function updateWordString()
{
for ((x=1;x <= $numberOfLettersInTheWord;x++))
do
currentLetter=$(echo $theWord|head -c $x|tail -c 1)
if [ "$1" == "$currentLetter" ]
then
wordString[$x]="$currentLetter"
fi
done
}


##The problem now is that i have an array that look like "f o o b a r"
##So when i want to test in the following function if the user has completed
## the word, in essence its testing if "foobar" == "f o o b a r"

function isGameOver()
{
if [ "$theWord" == "${wordString[*]}" ]
then
return 2
fi
}

touro nyc, msis616 Prof Robinson

Thanks
# 2  
Old 02-28-2012
Since this is an assignment, here's a hint (assuming you are using either kshell or bash)

Code:
a="keeping up with the Jones"
echo "${a// /}"

If you are unfamiliar with this form of variable expansion, have a peek at the Kshell/bash doc and search for 'parameter //pattern /string'
man/man1/ksh.html man page
This User Gave Thanks to agama For This Post:
# 3  
Old 02-28-2012
Booyah! I got it to work. Thank you.

I was able to make it work like this:
tempWordString1=${wordString[*]}
tempWordString2="${tempWordString1// /}"

and then testing if [ "$theWord" == "$tempWordString2" ]

I was not able to get it to work like this:
tempWordString="${${wordString[*]}// /}"
i tried playing with the syntax (pulling out $, adding " ")but couldn't get it to work. Is there a way to do parameter expansion directly on an array?

Again, thank you.

Last edited by lotsofideas; 02-28-2012 at 11:56 PM..
# 4  
Old 02-29-2012
Glad it worked, you discovered what I was thinking of (assigning it to a tmp variable and testing against that after removing blanks).

I also tried something similar to your other efforts, ${arrayname[@]// /}], and that fails. Actually it succeeds, but not in the way you wanted. The substitution is applied to each element as they are echoed, and not to the overall expansion as a whole. I also thought that setting the field separator might work, but alas that failed too.

So, best I can tell, no there isn't a way to apply it directly. Maybe somebody else round here might know better.
# 5  
Old 02-29-2012
the man page was useful.
# 6  
Old 02-29-2012
Moderator's Comments:
Mod Comment
Reminder: You are to follow
homework rules And
Please use next time
code tags for your code and data

Thread closed

Previous Thread | Next Thread
Test Your Knowledge in Computers #386
Difficulty: Medium
The Linux telnet command provides a user interface to a remote system using the SSH protocol.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

awk Associative Array and/or Referring to Field by String (Nonconstant String Value)

I will start with an example of what I'm trying to do and then describe how I am approaching the issue. File PS028,005 Lexeme HRS # M # PhraseType 1(1:1) 7(7) PhraseLab 501 503 ClauseType ZYq0 PS028,005 Lexeme W # L> # BNH # M #... (17 Replies)
Discussion started by: jvoot
17 Replies

2. Shell Programming and Scripting

awk string comparison unterminated quoted string andrule of thumb

I have the logic below to look up for matches within the columns between the two files with awk. In the if statement is where the string comparison is attempted with == The issue seems to be with the operands, as 1. when " '${SECTOR}' " -- double quote followed by single quote -- awk matches... (1 Reply)
Discussion started by: deadyetagain
1 Replies

3. Shell Programming and Scripting

awk : match only the pattern string , not letters or numbers after that.

Hi Experts, I am finding difficulty to get exact match: file OPERATING_SYSTEM=HP-UX LOOPBACK_ADDRESS=127.0.0.1 INTERFACE_NAME="lan3" IP_ADDRESS="10.53.52.241" SUBNET_MASK="255.255.255.192" BROADCAST_ADDRESS="" INTERFACE_STATE="" DHCP_ENABLE=0 INTERFACE_NAME="lan3:1"... (6 Replies)
Discussion started by: rveri
6 Replies

4. Shell Programming and Scripting

Reading a string and passing passing arguments to a while loop

I have an for loop that reads the following file cat param.cfg val1:env1:opt1 val2:env2:opt2 val3:env3:opt3 val4:env4:opt4 . . The for loop extracts the each line of the file so that at any one point, the value of i is val1:env1:opt1 etc... I would like to extract each... (19 Replies)
Discussion started by: goddevil
19 Replies

5. Shell Programming and Scripting

to extract string from main string and string comparison

continuing from my previous post, whose link is given below as a reference https://www.unix.com/shell-programming-scripting/171076-shell-scripting.html#post302573569 consider there is create table commands in a file for eg: CREATE TABLE `Blahblahblah` ( `id` int(11) NOT NULL... (2 Replies)
Discussion started by: vivek d r
2 Replies

6. Shell Programming and Scripting

Help with string comparison

#!/bin/sh PRINTF=/usr/bin/printf MACHINE_NAME=`uname -n` TIME=`date +"%H"` $PRINTF "Welcome to $MACHINE_NAME. What is your name?\n" read NAME if ; then $PRINTF "Good morning $NAME, how are you?\n" elif ; then $PRINTF "Good afternoon $NAME, how are you?\n" else $PRINTF "Good... (2 Replies)
Discussion started by: ikeQ
2 Replies

7. Shell Programming and Scripting

String Comparison

Is there a way to compare the permission string of two files and output the string if they match? For ex: -rw-r--r-- 1 user newuser 0 2009-03-12 16:45 file2 -rw-r--r-- 1 user newuser 0 2009-03-12 16:46 fileone output: -rw-r--r-- If they don't match output will be just... (3 Replies)
Discussion started by: squardius
3 Replies

8. UNIX for Dummies Questions & Answers

string comparison

Hi Guys i need to write a script to check the file structure I have added the the file headers in the configuration file and execute the file at the start of the script. Now the function checkFileStructure() { echo "Inside the function" filetocheck=$1 fileheader=$2 if ] then... (1 Reply)
Discussion started by: Swapna173
1 Replies

9. Shell Programming and Scripting

string comparison

Hello experts, (tcsh shell) Quite new to shell scripting... I have got a file with a single word on each line. Want to be able to make a comparison such that i can read pairs of words that are ROT13 to each other. Also, i would like to print the pairs to another file. Any help... (5 Replies)
Discussion started by: Jatsui
5 Replies

10. Shell Programming and Scripting

Removing Letters from Integer String

Hi all, I have a variable, on some machines it is '1024', which is fine, but on others it is '1024Mb' etc. I need this variable to simply be '1024', does anyone know how I could ensure this is always the case? Perhaps a command to remove any letters/characters that aren't integers if there is... (3 Replies)
Discussion started by: hodges
3 Replies

Featured Tech Videos