Programming :: Xargs With Output Of Find

Jul 15, 2011

I'm testing some multi-plat java code and I'm getting a bit frustrated with the Linux tests. I need to run the command:
Code:
$ java -jar /home/developer/TCO/TabletComicOptimizer.jar <file> <args[]>
against all the files that match a specific criteria. I've tried various find syntax and I can't seem to get it right.

Normally I would just create a bash script and populate the results of find into an array and then just enumerate the collection but in this specific case I want to demonstrate this operation at the bash terminal.

I've tried things like:
Code:
~/TCO $ find . -type f -iname "*.cb[rz]" | xargs java -jar TabletComicOptimizer.jar {} 1200x1800 ;
Thinking that the {} is the substitution for each file returned by find but it's not working. How do I execute my java program against each result in the find operation?

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Server :: Backup One Liner Find Xargs CP

May 25, 2011

I will eventually script this but wanted to know where I screwed up when trying to get this oneliner to work. In a nutshell, I want to created a backup directory, find any files that have changed in the last 48hrs and them copy them to the newly made backup directory.

PHP Code:
date=$(date +%m%d%Y)mkdir -p /home/test_dir/backup$date;find . -mtime 1|xargs -0 cp -r -t /home/test_dir/backup$date

When I do this I get:
PHP Code:
a bunch of junk !#$#$$#! File name too long

I also tried:
PHP Code:
date=$(date +%m%d%Y)mkdir -p /home/test_dir/backup$date;find 
. -mtime 1|xargs -0 cp -r {} /home/test_dir/backup$date

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Nov 18, 2010

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Code:
[virgil@thunderbird2:~/q] $ du -sh
336M.
[virgil@thunderbird2:~/q] $ find . -type d | wc
160 160 12038
[virgil@thunderbird2:~/q] $ find . -type f | wc
6721 6721 687549
[virgil@thunderbird2:~/q] $ /usr/bin/time find . -type f -print0 | xargs -0 -r shred -zu
0.00user 0.00system 10:11.76elapsed 0%CPU (0avgtext+0avgdata 3616maxresident)k
0inputs+0outputs (0major+285minor)pagefaults 0swaps
[virgil@thunderbird2:~]

[virgil@thunderbird2:~] $ dd if=/dev/urandom of=qwerty bs=336M count=1
1+0 records in
1+0 records out
352321536 bytes (352 MB) copied, 51.6693 s, 6.8 MB/s
[virgil@thunderbird2:~]
[virgil@thunderbird2:~] $ ls -l qwerty
-rw-r--r-- 1 virgil virgil 352321536 2010-11-18 15:13 qwerty
[virgil@thunderbird2:~]
[virgil@thunderbird2:~] $ /usr/bin/time shred -zu qwerty
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0inputs+2752528outputs (0major+235minor)pagefaults 0swaps

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In the above case I would like to grab just the first field from a filename (delimited by '_') from within an sh command. This is a simplified example, where normally I would be doing some further data processing with the sh command(s).

The error message that I get is:
Code: }`; echo $NEW: -c: line 0: unexpected EOF while looking for matching ``'
}`; echo $NEW: -c: line 1: syntax error: unexpected end of file.
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I get this behavior on Slackware 13.37, which includes BASH 4.1.010. Yes, BASH is my shell. I have a file called a.flac and I'm in the directory that contains it.

The output of the ls command is expected:
Code:
ls *.flac
gives:
Code:
a.flac

Removing the extension with basename works as expected:
Code:
basename a.flac .flac
gives:
Code:
a

Putting the above command in a variable substitution works as expected:
Code:
echo `basename a.flac .flac`
gives:
Code:
a

Using xargs with ls and a variable substitution works as expected:
Code:
ls *.flac | xargs -i echo `echo {}`
gives:
Code:
a.flac

However, when I try to add the basename command to the above command, it stops working.
Code:
ls *.flac | xargs -i echo `basename {} .flac`
gives:
Code:
a.flac

Whereas the result I expect is:
Code:
a
Why is it not working, and how do I make it work?

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Code:
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[code]....

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I want to find out my IP and I test this code from beej tutorial:

Code:
char hostname[128];
int i;
struct hostent *he;
struct in_addr **addr_list;
struct in_addr addr;

gethostname(hostname, sizeof hostname);
printf("My hostname: %s
", hostname);
he = gethostbyname(hostname);
if (he == NULL) { // do some error checking
herror("gethostbyname"); // herror(), NOT perror()
return 1;
} // print information about this host:
printf("Official name is: %s
", he->h_name);
printf("IP address: %s
", inet_ntoa(*(struct in_addr*)he->h_addr));
printf("All addresses: ");
addr_list = (struct in_addr **)he->h_addr_list;

for(i = 0; addr_list[i] != NULL; i++) {
printf("%s ", inet_ntoa(*addr_list[i]));
}
printf("
");
return 0;

But my output is this:
Code:
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gethostbyname: Unknown host

I heard that it works in windows, why isn't working in linux?

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echo 'file otherfile' | tr ' ' '
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How do I write a similar command that expands the globs? (I want to use xargs so the command can be run in parallel)

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Code:
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Code:
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Code:
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---
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Code:

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Code:

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