Visit Our UNIX and Linux User Community


Shell Script Find in File


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Shell Script Find in File
# 1  
Old 03-28-2011
Shell Script Find in File

Right, noob to shell scripting, playing a round for practice, wrote the following but it doesn't seem to work as expected, how could I fix/improve this script?

HTML Code:
#!/bin/bash
#set -v
#set -x

case $# in
1)
echo Searching for $1 in '*';
find . -iname '*' 2>/dev/null | xargs grep "$1" -sl 2>/dev/null;;
2)
echo Searching for $1 in $2;
find . -iname "$2" 2>/dev/null | xargs grep "$2" -sl 2>/dev/null;;
3)
echo Searching for $1 in $2 in dir $3;
find "$3" -iname "$2" 2>/dev/null | xargs grep "$1" -sl 2>/dev/null;;
*)
echo =Find in file=;
echo Usage $0 String [FileName] [FileDir];;

esac
# 2  
Old 03-28-2011
-iname '*' is redundant, leave it out and find does the same thing. find finds everything unless you tell it not to.

You might also want to add -type f to all your find calls to prevent you doing things like grepping on directories and such. That should eliminate most of the errors you had to redirect into /dev/null.

I notice for your second option you have grep "$2" instead of grep "$1" which I think is a mistake. Your search string is always your first parameter.

Beyond that, in what ways is it operating not as expected?

Otherwise: Your script looks pretty sane and even rather efficient. You even got xargs working right, which baffles most people new to shell scripting.
# 3  
Old 03-28-2011
Glad I got some things right

I've now updated the code to:
Code:
#!/bin/bash
#set -v
#set -x

case $# in
1)
echo Searching for $1 in '*';
find . -type f 2>/dev/null | xargs grep "$1" -sl 2>/dev/null;;
2)
echo Searching for $1 in $2;
find . -type f -iname "$2" 2>/dev/null | xargs grep "$1" -sl 2>/dev/null;;
3)
echo Searching for $1 in $2 in dir $3;
find "$3" -type f -iname "$2" 2>/dev/null | xargs grep "$1" -sl 2>/dev/null;;
*)
echo =Find in file=;
echo Usage $0 String [FileName] [FileDir];;

esac

Things that don't work as expected
Code:
oak204b:bin john$ fif test '*' /
Searching for test in 2to3 2to32.6 RSA_SecurID_getpasswd a2p a2p5.10.0 a2p5.8.9 aaf_install addftinfo afconvert afinfo afmtodit afplay afscexpand
alias allmemory amavisd amavisd-agent amavisd-nanny amavisd-release ant applesingle appletviewer apply apr-1-config apropos apt etc....

And I still get permission errors
Code:
find: ./.fseventsd: Permission denied
find: ./.Spotlight-V100: Permission denied
find: ./.Trashes: Permission denied

# 4  
Old 03-28-2011
In what way is it not expected?

I'm guessing you mean that it shows all the filenames? That's because you didn't quote $2 so it expands in the shell becoming all the names. * has a special meaning in the shell too. Quote it like "$2" to stop it expanding.

Oh well, I guess you really do have some dirs you don't have access to. The -type f should help reduce the number anyway, and the redirection will take care of it like you had before.

Last edited by Corona688; 03-28-2011 at 07:02 PM..

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Homework & Coursework Questions

Shell script to find file type

1. The problem statement, all variables and given/known data: Write a shell script that takes a single command line parameter, a file path (might be relative or absolute). The script should examine that file and print a single line consisting of the phrase: Windows ASCII if the files is an... (4 Replies)
Discussion started by: kwatt019
4 Replies

2. UNIX for Dummies Questions & Answers

Find error in the shell script file

echo "******Select Option:******" echo "1 - script1" echo "2 - script2" echo "3 - script3 " read option echo "You have selected" $option"." if then /scratch/username/script1.sh elif then /scratch/username/script2.sh elif then /scratch/username/script3.sh else echo "Please try again... (12 Replies)
Discussion started by: Dish
12 Replies

3. Shell Programming and Scripting

Shell script to find the sum of argument passed to the script

I want to make a script which takes the number of argument, add those argument and gives output to the user, but I am not getting through... Script that i am using is below : #!/bin/bash sum=0 for i in $@ do sum=$sum+$1 echo $sum shift done I am executing the script as... (3 Replies)
Discussion started by: mukulverma2408
3 Replies

4. Shell Programming and Scripting

How to find out the shell of the shell script?

Hello My question is: How to find out the shell of the shell script which we are running? I am writing a script, say f1.sh, as below: #!/bin/ksh echo "Sample script" From the first line, we can say this script will run in ksh. But, how can we prove it? Can we print anything inside... (6 Replies)
Discussion started by: guruprasadpr
6 Replies

5. Shell Programming and Scripting

How to find invalid URL in a text file using shell script?

How to find and remove invalid URLs in a text file using shell script? (1 Reply)
Discussion started by: vel4ever
1 Replies

6. UNIX for Dummies Questions & Answers

Shell script find word from one file and insert in another file

Hi, I am new to shell scripting. I need a bash shell scripts which search and grep a parameter value from input.txt file and insert it in between two semicolon of second line of output.txt file. For example The shell script search an IP address as parameter value from input.txt ... (2 Replies)
Discussion started by: sunilkumarsinha
2 Replies

7. Shell Programming and Scripting

Shell script to find specific file name and load data

I need help as to how to write a script in Unix for the following: We have 3 servers; The mainframe will FTP them to a folder. In that folder we will need the script to look and see if the specific file name is there and load it to the correct table. Can anyone pls help me out with... (2 Replies)
Discussion started by: msrahman
2 Replies

8. Shell Programming and Scripting

How to find yesterdays file - shell script

Hey guys - i have a script (below) that searches for current files in a particular directory. However i was wondering how to make it search for "yesterdays" file. For instance it looks for a file from yesterday and no older than that. I used stat command to check for file information: ... (6 Replies)
Discussion started by: DallasT
6 Replies

9. UNIX for Dummies Questions & Answers

shell script to find noof characters in a file name

hiiii shell script to find noof characters in a file name, when you run ls -l (using awk) I tried with this ls -l > temp awk -F"," '{print $1 " " expr length $9}' temp but it give some other value instead of file name length (error value like , 563,54,55,56....).How to prnint the... (10 Replies)
Discussion started by: krishnampkkm
10 Replies

10. Shell Programming and Scripting

Shell script to Find file size

Hi, I am writing a script which takes the input file name and concat as a new file by appending a "1" to the file name. However i am not able to get the size of this new file. I am not sure where i am going wrong. Please check the script and help me get this working. #!/bin/sh ... (1 Reply)
Discussion started by: ragsnovel
1 Replies

Featured Tech Videos