Programming :: Bash: String Verifier Doesn't Work

May 26, 2011

I'm currently learning bash programming and am trying to create a program to maintain a list of people. Here is the code so far:

Code:

#!/bin/bash
# Namelist
clear

[code]....

As you can see, I attempted to build in a protective measure to prevent duplicate entries using "if grep -Fxq "$FN $LN" /home/andrea/namelist.txt", FN and LN being first name and last name as you can see in the first read operation. However, this fails to actually work. Demonstrations:

[URL]

It saves the details to the file rather than displaying the error message, or in other words, it doesnt check the file properly.

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Programming :: Bash String Splitting Into Array?

Oct 14, 2010

I am using gnu bash 3.2I need to split the string into array like

a=this_is_whole_world.file # split [_.]
I need to split this on _ and . some thing like this
a[0]=this
a[1]=is
a[2]=whole
a[3]=world
a[4]=file

preferable using bash regex. if not sed is also ok.

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Programming :: Bash Concatenating String To Variable ?

Jan 18, 2011

I have a program that loops over each word in a sentence. I need to append a constant to the beginning and end of each word. It works up until the last word on the line.

Code:

Output:

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Programming :: BASH - If Variable -eq String Not Working ?

Jan 24, 2010

Here is the code:

Code:

How ever when I run this script I get the following error

Quote:

I just don't get it, I have racked my brain trying to figure out every combination of how I should write this if statement and I can't get it to work.

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Programming :: Bash Regex String Extraction?

Jun 10, 2011

Code:
g echo ${mm[$j]}
4 BashNotes

[code]...

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Programming :: Bash Removing String From File?

Aug 7, 2010

I am trying to remove everything before my string code...

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Programming :: Using Bash To Append A String To Array?

May 19, 2011

I have the following function that does not iterate through the array I want to be able to do some manipulation on each element in the array[@].it appears the below array has only one item in the array whereas i want the array to have 3 items hence the loop three times printing the message Any ideas why this is not happening ?

function foo() {
name =$1
array=( "$2" )

[code]...

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Programming :: Bash Thinks String Variable Is A Numeric One

Jul 7, 2011

Bash 3.1.7

Code:

Code:

Code:

I think read A1 A2 makes A1, A2 string variables. Then, when A2 gets the value 01, '01' should be a string. But for some reason bash takes it as numeric. I know there are no types in bash.

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Programming :: Nontrivial String Replacement With Bash On-board Means?

Jan 9, 2011

My simple bash-script replaces --> by the HTML-entity for the right arrow. To be precise, it replaces --*> by → Until now, I used sed, for example:

Code: $ flight='AMS --> JFK'
$ echo "$flight" | sed -e 's/ --*> / → /g'

AMS → JFK With sed, -* matches zero or more dashes, because for sed the * is the Kleene Star matching zero or more instances of the previous element. So with sed, --*> matches exactly what I want:

Code:

->
-->
--->
---->

Because sed seems oversized for that task, I played around to accomplish the same with on-board means of bash without using sed. On first thought, this line looks like doing the same but it isn't:

Code: $ flight='AMS --> JFK'
$ echo "${flight// --*> / → }"

AMS → JFK As I recently learnt in this forum, this * isn't the Kleene Star. It is a multi-character wildcard matching any zero or more consecutive characters. So here, --*> matches:

Code:

->
-->
--->
---->
-<>
->>

-abc> And if you continue your flight to SEA, then the result is totally wrong because the * matches greedily:

Code: $ flight='AMS --> JFK --> SEA' $ echo "${flight// --*> / → }" AMS → SEA

The sed line above would produce the correct result and would match the dashes correctly.

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Programming :: Find String In Text File (bash Script)

Apr 17, 2011

write such script (bash script). I have some text file with name filename.txt I must check if this file contains string "test-string-first", I must cut from this file string which follows string "keyword-string:" and till first white-space and save it to some variable.

For example. File: PHP Code: PHPCode:
Start15022011Eng12-3-42
SN123232442211test-string-first
SN322211securities
HHkeyword-string:123456321-netmark(11-22)

[Code].....

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Programming :: Bash: Functional Difference Between Process Substitution And Here String With $( )

Mar 14, 2010

Further to solved LQ thread Bash: how to populate a list of arbitrarily named files?, what is the functional difference between feeding a loop with process substitution and feeding it with a here string with embedded command substitution? ABSG pages: process substitution, here string and command substitution. This works

Code:

while IFS= read -r -d '' file
do
files+=("$file")
done < <(find $dir -type f -print0)

[code]....

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Programming :: Bash Regexp String Compare Stopped Working?

Oct 20, 2010

Have a bash script which contains a line like this:

if [[ ${array[${last}]} =~ "screenpc.PRODUCTION.*" ]]

which WORKED as expected in bash 4.0.33 and now fails in 4.1.2

Instrumented the script to print the value of the left-hand side and it is exactly what is expected.

As noted above, this has been working fine until we installed Fedora 13 (kernel 2.6.33), and now it fails.

Tried setting shell 'extglob' to On with same results.

Did something change? Are there other shell/bash options that need to be set?this has the whole installation stopped!

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Programming :: Find A Substring/member In A String/array Using Bash?

Oct 13, 2010

This may be a basic bash array/string operation related question, but I couldn't find any direct answer. So here it goes:I have a lot of data sorted in various directories. All directories need same processing except for a special group of directories. I have a symbolic link of the script in discussion in each directory. I want the script to get the name of the current directory, check if that belongs to special group and do specific operations.So I get the name of the directory

Code:
mm=`basename `pwd``
Now the the group of directories that needs something different to be done, contains these

[code]...

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Programming :: The 'a' String Doesn't Have Any Spaces In It?

Nov 27, 2010

I have a file of the type:

a = b

where a is any string and b is an integer The 'a' string doesn't have any spaces in it.

Everything was running fine till I was searching for 'a' and finding value 'b' by expression

Code:
string="$a"
egrep -i -m1 "^[[:space:]]$string[[:space:]]*=" | awk -F'=' 'gsub(/^[[:space:]]+/,"",$2)gsub(/[[:space:]]+$/,"",$2){print $2}'

I recently ran into a situation where in the string 'a' had symbols like $, & in it. Though I haven't checked it for & but $ is definitely breaking my code

Any way to egrep for string with $ ??

One way I though was to replace every occurence of $ with $ in my search expression but that would involve an extra processing each time

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Programming :: Copy String A To String B And Change String B With Toupper() And Count The Chars?

Oct 22, 2010

copy string a to string b and change string b with toupper() and count the chars

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Programming :: Find And Replace A String In A File Using Perl Command From Bash Script?

Feb 14, 2011

I wanted to find and replace a string from a perl file. I have written a script in bash which runs the following command.

perl -pi -e "s/$findstring/$replacestring/" testfile
where as $findstring = print F_WC_TMP"$line
";
and $replaceString = $line = join ' ', split ' ', $line; print F_WC_TMP"$line
";

But when I am running the above command, i think it is replacing the $findstring with the above mentioned string and hence it contains a $line, it is looking for the variable $line and not finding the exact string. I am confused about how to search for a string that contains $ in it and replace it with another $string.

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Programming :: String Comparison - Get Regular Expression To Work In If / Else Statement?

Jun 29, 2010

how do I get this regular expression to work in an if/else statement? This is just a little script for learning BASH. don't be too harsh.

This script will test if a certain number of files with 1-4 in their filename exist and print their filename. An error message will be printed if not.

#
for i in `ls file[1-9]`
do
if [[ "$i" == *1-4 ]] ; then
echo "This file, $i, ends in a number between 1-4"
else
echo "Error, this file, $i, does not end with a number between 1-4"
fi
done

I get this error. ./file_test.sh: 13: [[: not found

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Fedora :: Bind C-u To Kill-whole-line In Bash Doesn't Work

Mar 19, 2010

I'd like control-u to erase the whole line, instead of only erasing backwards from the current point. I tried

bind -r "C-u"
bind -r C-u
bind -r ^U

to erase the current binding for control-u, but after running any / all of the above, bind -p still tells me

"C-u": unix-line-discard

bind "C-u":kill-whole-line doesn't work either. How can I change the binding of control-u to kill-whole-line?

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Programming :: Pthread - Take String From The Command Line And Creates A Thread To Print The String

May 3, 2011

I've been trying to understand pthread in C a little better. So I made a simple program that takes in a string from the command line and creates a thread to print the string. I've looked online and copied the basic concepts but there are something things I'm confused about. The programs works just fine, but I have questions. Here's what I have so far.

[Code]....

One thing I'd like to know is why the 3rd argument in the pthread_create function which is my SendMessage function needs to be typecasted to a void pointer and then send the address of the function. Also as for the 4th argument, I would see typecasting to void pointer in some of the pthread examples I saw online, but in my case I'm passing a char pointer, would this be correct? In which case would I ever want to pass a void pointer?

Do I need a pthread_exit(NULL) in my main and in the SendMessage function? If so, why? I added the sleep() function so that I could let the pthread_exit function in my SendMessage function execute first. I simply saw that the online examples on pthread had pthread_exit() in both locations.

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Programming :: Bash: Regexp In 'if' Doesn't Evaluate Correctly

Mar 1, 2011

I'm using an 'if' statement to check whether one of positional arguments is a word or a construction like "x-y", but something doesn't seem right.

Here is the relevant part of the code:

Code:
if [[ "$3" =~ [a-Z]-[a-Z] || "$3" =~ [a-Z] ]]; then
grepRange=$3; else grepRange=$4
fi
And for the input like this:

[Code]....

but shouldn't the $grepRange variable be blank in this case?

Bash version is 4.1.7(1)

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Programming :: Using Sed Replace Line Containing Particular String By A Single String?

Oct 16, 2010

I have a set of lines as ahown below:

Leon went to school
Leon came back from school..
Leon had dinner...

I have to replace the line containing "dinner" by a single string LUNCH...

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Programming :: Creates String Suffixes Out Of A Reference String?

Feb 25, 2011

I need to creates string suffixes out of a Reference string. for eg. suffixes of abcdefg will be

1)bcdefg
2)cdefg
3)defg
and so on...

create an array of pointers to point to the first few characters and then use that pointer to print the rest of the string.But when i print using the pointer i get GARBAGE values! shudn't std::cout<<ptr[w] print the string following the char it is pointing to? why do i get garbage values?

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Programming :: C - Put A Specific Arbitrary Part Of A String Into It's Own String?

Apr 18, 2010

So if I'm given a location of a file like:

How can I just take the type of the file at the end? I know I can use strrchr() for a period to get the pointer to the period just before file type. Is there a build in string function that will just take the rest of the string from a certain point on forward in the string? I know it wouldn't be much work to make it myself, but I figured I would find out if it already existed before doing it.

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Programming :: Convert String To Integer Back To String C++ ?

Mar 13, 2010

Code:

The error is:

Code:

What I want to do is take input of ip4 as a string, convert it to an integer to add 1 to it, then reconvert it back to a string. Its not working.

My full code is:

Code:

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Programming :: Bash - Renaming Files Won't Work

Apr 1, 2010

I'm trying to rename a lot of files getting rid of the space on the names. For that purpose I wrote this very simple bash script, but for some reason is not working.

Code:
for i in "$(ls)"
do
j=$(echo "$i" | sed 's/ /_/g')
mv "$i" "$j"

done But what I get in return for each line is just one long file name with all the file names concatenated. I've tried with echo -e "$i" as well with no results. This has to be something really simple that I'm missing but I just can't see it.

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Programming :: Assigning Custom String To Std::string In C++?

Oct 12, 2009

I've been given a custom-made string class which handles string, wstring and bstr. It has a number of methods and assignment operators to convert to and from different types. The app I work on compiles happily in VS6 and VS2008, but when trying to compile in Redhat (version 4.1.1 in Redhat 5.0)

[code]....

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Programming :: How To Check If All Letters Of One String Are In Another String?

Nov 11, 2010

I have the following two type of strings1: A/D2: A/C/DI am trying to write a subroutine to check whether all of the letters in string 1 appears in string 2. If yes, return true. If not, return false. In the above example, all the letters (A and D) in string 1 are also present in string 2, so I return true.

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Programming :: Auto_extract.sh Bash Script - Does Not Work With Any Paths That Contain Spaces

Jan 25, 2011

Have worked with Linux at home for some time and have wrote the below script.

This script is run when a .torrent file finishes downloading and extracts any .rar files into an extracted directory.

However there are 2 thing that i cannot for the life of me get working.

These are:

1. I need the script to check a txt file to see if the file has been extracted previously.

2. The script does not work with any paths that contain spaces.

Code:

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Programming :: Command Line Works - Won't Work From Inside Bash Script

Feb 16, 2011

Writing script to create backup of file by adding datetime to file name. Basically test for file presence if there, cp with datetime then rm original cp works fine from command line but get cannot stat `full path to file': No such file or directory

Code:

Here are the errors: cp: cannot stat `~/html/CVP_dadamail/.dada_files/.logs/errors.txt': No such file or directory rm: cannot remove `...': No such file or directory

The for statement is a placeholder as I have same file to backup out of several directories. using "bash -x scriptname" -OR- inserting echos, I can see I've constructed the strings properly. Believing it might be related to the hidden directories, I tried setting the shopt "glob" options to no avail.

Ultimately I'll add the other directories to the for loop and then run this from a cron job, so if you see potential pitfalls knowing I'm headed in that direction...believe construct would be

Code:

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General :: Why Does Running A Program In Bash Work, When Running It In The Menu Doesn't?

Jul 26, 2010

I presume there is something in the JWM window manager - or Puppy Linux Lupu 5.01 itself that is conflicting with the normal loading of GMPLAYER....

I would like to know how to troubleshoot, and fix this problem if possible (even a workaround would be great).

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