Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: bash: How to reuse the search result of "find"
Top Forums Shell Programming and Scripting bash: How to reuse the search result of "find" Post 302607560 by LessNux on Wednesday 14th of March 2012 06:17:42 PM
Old 03-14-2012
Question bash: How to reuse the search result of "find"
Code:
find . -type f -print0 | xargs -0 chmod 600

find . -type f


On bash, I would like to pass the search result of "find" to another command as well as to the standard output. The above code performs the same search twice -- once for "xargs -0 chmod" and another for stdout. I would like to spare this redundancy. I would like to search only once and would like to use the search result for another command and reuse it for the standard output.

Assume that the null character (0x00) is the only character that filenames never contain. Thus, assume that filenames may contain newline (0x0A) characters. In the above code, -print0 and -0 options specify the separator to be a null character.

If I allow myself to use a file to save the search result, then the work can be accomplished in the following manner.

Code:
find . -type f -print0 > /tmp/found.dat
cat /tmp/found.dat | xargs -0 chmod 600
cat /tmp/found.dat | tr \\0 \\n

However, I do not want to use a file to save the search result. So, I tried a variable to save the search result.

Code:
vFound="$(find . -type f -print0)"
echo "$vFound" | xargs -0 chmod 600
echo "$vFound" | tr \\0 \\n
#or 
#printf %s "$vFound" | xargs -0 chmod 600
#printf %s "$vFound" | tr \\0 \\n

However, the above code failed. It seems that bash removes null characters when bash expands the variable.

I also tried "tee" to make an attempt to split the search result to "xargs -0 chmod" and stdout. The following attempt with "tee" failed.

Code:
find . -type f -print0 | tee - | xargs -0 chmod 600

Can you show me how to use the search result of "find" for another command and reuse it for the standard output without saving the search result to a file? I failed in a method with a variable and a method with "tee".

Many thanks in advance.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

"find command" to find the files in the current directories but not in the "subdir"

Dear friends, please tell me how to find the files which are existing in the current directory, but it sholud not search in the sub directories.. it is like this, current directory contains file1, file2, file3, dir1, dir2 and dir1 conatins file4, file5 and dir2 contains file6,... (9 Replies)
Discussion started by: swamymns
9 Replies

2. UNIX for Dummies Questions & Answers

"find": search the a regex of FILES??

I want to use the find command to search a ton of files, but I want to break it up into multiple machines. I want to search for files with "filename." in the title. The location I want to search is: /u/*/*/*/stuff On the first computer I want to search: /u//*/*/stuff Right now I am doing... (1 Reply)
Discussion started by: msf5042
1 Replies

3. Shell Programming and Scripting

BASH find filenames in list that match certain "pattern."

I guess by "pattern," I mean something different from how that word is defined in the Linux world. If you take $ to mean a letter (a-z) and # to mean a number (0-9), then the pattern I'm trying to match is as follows: $$$##-####-###-###.jpg I'd like to write a script that reads in a list of files... (4 Replies)
Discussion started by: SilversleevesX
4 Replies

4. Shell Programming and Scripting

Simplify Bash Script Using "sed" Or "awk"

Input file: 2 aux003.net3.com error12 6 awn0117.net1.com error13 84 aux008 error14 29 aux001.ha.ux.isd.com error12 209 aux002.vm.ux.isd.com error34 21 alx0027.vm.net2.com error12 227 dux001.net5.com error123 22 us008.dot.net2.com error121 13 us009.net2.com error129Expected Output: 2... (4 Replies)
Discussion started by: sQew
4 Replies

5. Shell Programming and Scripting

grep with "[" and "]" and "dot" within the search string

Hello. Following recommendations for one of my threads, this is working perfectly : #!/bin/bash CNT=$( grep -c -e "some text 1" -e "some text 2" -e "some text 3" "/tmp/log_file.txt" ) Now I need a grep success for some thing like : #!/bin/bash CNT=$( grep -c -e "some text_1... (4 Replies)
Discussion started by: jcdole
4 Replies

6. Shell Programming and Scripting

Using a single "find" cmd to search for multiple file types and output individual files

Hi All, I am new here but I have a scripting question that I can't seem to figure out with the "find" cmd. What I am trying to do is to only have to run a single find cmd parsing the directories and output the different file types to induvidual files and I have been running into problems.... (3 Replies)
Discussion started by: swaters
3 Replies

7. Shell Programming and Scripting

Find lines with "A" then change "E" to "X" same line

I have a bunch of random character lines like ABCEDFG. I want to find all lines with "A" and then change any "E" to "X" in the same line. ALL lines with "A" will have an "X" somewhere in it. I have tried sed awk and vi editor. I get close, not quite there. I know someone has already solved this... (10 Replies)
Discussion started by: nightwatchrenba
10 Replies

8. UNIX for Dummies Questions & Answers

"Help with bash script" - "License Server and Patch Updates"

Hi All, I'm completely new to bash scripting and still learning my way through albeit vey slowly. I need to know where to insert my server names', my ip address numbers through out the script alas to no avail. I'm also searching on how to save .sh (bash shell) script properly.... (25 Replies)
Discussion started by: profileuser
25 Replies

9. Shell Programming and Scripting

find . -path "*_nobackup*" -prune -iname "*.PDF" \( ! -name "*_nobackup.*" \)

These three finds worked as expected: $ find . -iname "*.PDF" $ find . -iname "*.PDF" \( ! -name "*_nobackup.*" \) $ find . -path "*_nobackup*" -prune -iname "*.PDF" They all returned the match: ./folder/file.pdf :b: This find returned no matches: $ find . -path "*_nobackup*" -prune... (3 Replies)
Discussion started by: wolfv
3 Replies

10. Shell Programming and Scripting

Bash script - Print an ascii file using specific font "Latin Modern Mono 12" "regular" "9"

Hello. System : opensuse leap 42.3 I have a bash script that build a text file. I would like the last command doing : print_cmd -o page-left=43 -o page-right=22 -o page-top=28 -o page-bottom=43 -o font=LatinModernMono12:regular:9 some_file.txt where : print_cmd ::= some printing... (1 Reply)
Discussion started by: jcdole
1 Replies

LEARN ABOUT REDHAT

openvt

OPENVT(1)							     Linux 1.x								 OPENVT(1)

NAME

       openvt - start a program on a new virtual terminal (VT).

SYNOPSIS

       openvt [-c vtnumber] [-s] [-u] [-l] [-v] [--] command command_options

DESCRIPTION

       openvt  will  find the first available VT, and run on it the given command with the given command options, standard input, output and error
       are directed to that terminal. The current search path ($PATH) is used to find the requested command. If no command is specified  then  the
       environment variable $SHELL is used.

   OPTIONS
       -c vtnumber
	      Use the given VT number and not the first available. Note you must have write access to the supplied VT for this to work.

       -s     Switch to the new VT when starting the command. The VT of the new command will be made the new current VT.

       -u     Figure out the owner of the current VT, and run login as that user.  Suitable to be called by init. Shouldn't be used with -c or -l.

       -l     Make the command a login shell. A - is prepended to the name of the command to be executed.

       -v     Be a bit more verbose.

       -w     wait  for command to complete. If -w and -s are used together then openvt will switch back to the controlling terminal when the com-
	      mand completes.

       --     end of options to openvt.

NOTE

       If openvt is compiled with a POSIX (GNU) getopt() and you wish to set options to the command to be run, then you must  supply  the  end	of
       options -- flag before the command.

EXAMPLES

       openvt can be used to start a shell on the next free VT, by using the command:

       openvt bash

       To start the shell as a login shell, use:

       openvt -l bash

       To get a long listing you must supply the -- separator:

       openvt -- ls -l

HISTORY

       Earlier, openvt was called open.  It was written by Jon Tombs <jon@gtex02.us.es or jon@robots.ox.ac.uk>.  The -w idea is from "sam".

SEE ALSO

       chvt(1), doshell(8), login(1)

19 Jul 1996							       V1.4								 OPENVT(1)
All times are GMT -4. The time now is 10:18 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy