Visit Our UNIX and Linux User Community


search and Replace


 
Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users search and Replace
# 1  
Old 09-14-2001
MySQL search and Replace

hello,

How to search a Word in a shell file and if that exists echo that the word exists and stop that operation and if that doesn't exists then echo word not found.

Thanks in advance.

Bye
# 2  
Old 09-14-2001
Code:
#!/bin/sh
# check.sh
# This script takes two arguments -
# The first is the word you a looking for,
# and the second is the file you want to find
# the word in.
# Example: check.sh lamb haggis
# Will look for the word "lamb" in the file "haggis"
if [ "$#" -ne "2" ] ; then
     echo "Usage: "
     echo "`basename $0` {search string} {file} "
     exit 2
fi
if [ -f "$2" ] ; then
grep "$1" $2 > /dev/null 
case $? in
     0) echo -e "\nThe word \"$1\" was found in the \"$2\" file! \n" ;;
     *) echo -e "\nThe word \"$1\" was NOT found in the \"$2\" file! \n" ;;
esac
exit 0
else
echo "The \"$2\" file does not exist"
exit 2
fi

This is one of many ways to do it...

Last edited by LivinFree; 09-14-2001 at 05:16 AM..
# 3  
Old 09-14-2001
I was just thinking about it, and I guess this isn't the most helpful was to explain this. I'm going to add some comments (in bold) to the code, so you can see what's happening step by step:
Quote:
Originally posted by LivinFree
Code:
#!/bin/sh
# check.sh
# This script takes two arguments -
# The first is the word you a looking for,
# and the second is the file you want to find
# the word in.
# Example: check.sh lamb haggis
# Will look for the word "lamb" in the file "haggis"
# This is to make sure there are exactly two arguments
# passed to the script. If not, it will give you a little hint...
# The "$#" counts the number of aguments, and -ne is the same
# as saying "not equal".
if [ "$#" -ne "2" ] ; then
     echo "Usage: "
     echo "`basename $0` {search string} {file} "
     exit 2
fi
[/b]# Right here, we check to make sure the file we are searching
# exists, and is a regular file. For more information on the -f
# statement, use the 'man test' command.[/b]
if [ -f "$2" ] ; then
# We don't actually want to see the results of the search,
# we only want to know if it was successful, so we send the
# output to /dev/null - to nowhere-land
grep "$1" $2 > /dev/null 
# The "$?" construct tells you the status of the last command.
# if $? is equal to zero, the command was successful, if it is any
# number other than 0, there was a problem
case $? in
     0) echo -e "\nThe word \"$1\" was found in the \"$2\" file! \n" ;;
     *) echo -e "\nThe word \"$1\" was NOT found in the \"$2\" file! \n" ;;
esac
exit 0
# This is what happens if the file did not exist (see above)
# This is our backup plan - it keeps grep from getting "stuck"
# if there is no file
else
echo "The \"$2\" file does not exist"
exit 2
fi

The exit 0 tells it to exit successfully (remember $?), and exit 2 tells it that there were errors, and to exit right away. I hope this is a little more helpful
This is one of many ways to do it...
By saying this is one of many, I mean it - here is an example of a one-liner that will do nearly the same thing without the error handling or variables:
Code:
grep lamb haggis > /dev/null && echo Word found in file || echo Word NOT found in file

As you can see, the "grep" command is the same as in the script, but the messages are handled differently. The commands after the "&&" will execute if the previous command was successful, and the command after the "||" will execute if it was not successful.

Geez, I'd make a horrible teacher...

Last edited by LivinFree; 09-14-2001 at 05:54 AM..
# 4  
Old 09-14-2001
hello,

consider searching a word without passing any parameter , but only giving single constant word and single file.

thanks.
# 5  
Old 09-14-2001
Well, if you want to hard-code the names into the script, that would be even easier...

Code:
#!/bin/sh
grep {your_word} {file} > /dev/null && echo "Word found" || echo "Word not found"

Very similar to the example I gave above, simply insert into a file and execute...

Previous Thread | Next Thread
Test Your Knowledge in Computers #966
Difficulty: Medium
In HTML5 the 'ol' element has a new attribute called 'inline'
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Nested search in a file and replace the inner search

Hi Team, I am new to unix, please help me in this. I have a file named properties. The content of the file is : ##Mobile props east.url=https://qa.east.corp.com/prop/end west.url=https://qa.west.corp.com/prop/end south.url=https://qa.south.corp.com/prop/end... (2 Replies)
Discussion started by: tolearn
2 Replies

2. Shell Programming and Scripting

Vi search and replace

Hi, I need help with search and replace for the following string using vi .. if ];then to if ];then can this be done in one search and replace or need multiple ? Thanks (3 Replies)
Discussion started by: talashil
3 Replies

3. UNIX for Dummies Questions & Answers

Help with search and replace or search only of / in vi

Hi all, I am editing a config file in vi that has a / on it. At the moment, search and replace looks alright as am able to use a # as a temporary separator, i.e. :,$s#/u01/app#/u02/app#g For doing a search, I have to escape the / do. So if I want to search for /u01/app, I am having to do... (2 Replies)
Discussion started by: newbie_01
2 Replies

4. UNIX for Dummies Questions & Answers

Search and Replace

I am trying to search and replace using two different files with strict search rules. One file contain some data and the other file contain some numbers as shown below. DataFile.txt >L1_T1 text data... text data.. >L1_T1 text data... text data.. >L1_T1 text data... text data.. ........ (4 Replies)
Discussion started by: Fahmida
4 Replies

5. Shell Programming and Scripting

perl search and replace - search in first line and replance in 2nd line

Dear All, i want to search particular string and want to replance next line value. following is the test file. search string is tmp,??? ,10:1 "???" may contain any 3 character it should remain the same and next line replace with ,10:50 tmp,123 --- if match tmp,??? then... (3 Replies)
Discussion started by: arvindng
3 Replies

6. Shell Programming and Scripting

Search and Replace

Hi!!! I have following xml file with 3 sections. aaa1bbb-ccc default aaa1bbbdd default 0 11 23 * * aaa2bbb-ccc default aaa2bbbdd default 0 11 23 * * aaa3bbb-ccc default aaa3bbbdd default 0 15 23 * * (15 Replies)
Discussion started by: tdev457
15 Replies

7. Shell Programming and Scripting

awk - replace number of string length from search and replace for a serialized array

Hello, I really would appreciate some help with a bash script for some string manipulation on an SQL dump: I'd like to be able to rename "sites/WHATEVER/files" to "sites/SOMETHINGELSE/files" within the sql dump. This is quite easy with sed: sed -e... (1 Reply)
Discussion started by: otrotipo
1 Replies

8. Shell Programming and Scripting

Search and replace

I have a script which has several occurences of statement like command: $UCMDPATH/xyz abc I would like to replace the entire line starting from $UCMDPATH with the ls -ltr command eg: Prior to change:: command: $UCMDPATH/xyz abc After change: command: ls -ltr Is there a way to do... (12 Replies)
Discussion started by: jobbyjoseph
12 Replies

9. Shell Programming and Scripting

Perl: Search for string on line then search and replace text

Hi All, I have a file that I need to be able to find a pattern match on a line, search that line for a text pattern, and replace that text. An example of 4 lines in my file is: 1. MatchText_randomNumberOfText moreData ReplaceMe moreData 2. MatchText_randomNumberOfText moreData moreData... (4 Replies)
Discussion started by: Crypto
4 Replies

10. Shell Programming and Scripting

search and replace

hi all, the problem is like this...... i setup a file (Env.txt) which handles all the values. NAME1=xxxxxx, where xxxxx is the value NAME2=xxxxxx GGGGG=uusufu I have 6 files, where i will append the values from env.txt. These files has no specific format. all i want is to append the... (1 Reply)
Discussion started by: tungaw2004
1 Replies

Featured Tech Videos