xargs is a command that executes another command and generates its arguments from stdin

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207 views

What is the syntax for passing the output of a command to xargs?

As an example I am using xdotool to obtain the list of windows on my desktop, which outputs a list of numbers, one on each line. An example command for that is: xdotool search --name "a_program", ...
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1answer
154 views

How to make xargs ping and head output as expected?

Given an array of domains I would like to obtain their IP addresses, in the following format: 98.139.183.24 98.137.236.24 This script #!/bin/bash domains=(yahoo.com yahoo.ca) printf "%s\0" ...
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3answers
145 views

zsh's “echo SomeText >> **/filename” in other shells

I need to fill all files with a specific filename (recursively) with a text. In zsh this can be done with echo SomeText > **/TheFileName I search generic solutions for sh-compatible and/or tcsh ...
4
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1answer
276 views

Blank lines when executing “grep | xargs” in a “find -exec”

I'm trying to list all directories of a web server that are blocked by Apache via a .htaccess (containing deny from all). I've managed to get the list of blocking .htaccess but when I try to extract ...
4
votes
1answer
124 views

Why do bash variables disappear when I use xargs?

I have a simple bash script and want to count how often a command gets called. Here is a minimal example, the counter is called c and should be 4 at the end: #!/bin/bash c=0; for a in X Y; do for ...
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2answers
61 views

remove files after insertion into tarball

I want to limit the number of files that get put into a tar ball and erease them after they've been inserted into the tarball and being indipendent from the current directory. I've tried this: tar -C ...
2
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2answers
166 views

Output of command when piped to another command

I am running a command which does a quick checksum of some file like so find / -type f -ctime +30 -mtime +30 -atime +30 -exec md5sum {} \; | xargs -P 4 and I am trying to run it in parallel with ...
2
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1answer
197 views

How to create infinite pipe of strings in bash

I have about 10 links in file links.txt. I download them through cat links.txt | xargs -i --max-procs=4 bash -c "wget {}" I whould like do it repeatedly like while : do cat links.txt | ...
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1answer
458 views

How to create multiple tar files with bash script and use date as file names?

I have a lot of files and want to create an archive for every 100 files i.e. the first 100 files are in one tar file, and the 101st to 200th files are in another tar file. And I want to use the date ...
1
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1answer
255 views

How to get exit code of a parallel process launched by xargs?

I'd made a script for launching parallel rsync process: #! /bin/bash LIST=$1 DEST_DIR=$2 RSYNC_OPTS=$3 #echo "rsyncing From=$SRC_DIR To=$DEST_DIR RSYNC_OPTS=$RSYNC_OPTS" echo $LIST|xargs -n1 -d, ...
2
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1answer
684 views

Convert newlines to null-delimited when using tail

How can I change the output from tail to use null-terminated lines instead of newlines? My question is similar to this one: How to do `head` and `tail` on null-delimited input in bash?, but differs ...
9
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3answers
490 views

How to execute a command repeatedly with different arguments?

I'm on Ubuntu. I copied some arguments (separated by newline) and I can use xsel to print them out like this $ xsel arg1 arg2 arg3 arg4 ... Now, I want to use each of these arguments for another ...
2
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1answer
439 views

When should you use subshells vs `xargs`?

Many simple commands using xargs could be rewritten as commands using subshells. For instance, here is something I was using earlier today, to concatenate the ten largest binaries in /usr/bin, written ...
3
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2answers
3k views

How can I concatenate all files in a directory together in one command line operation? [duplicate]

I have 1000 csv files in a directory. I would like to concatenate them all together in order. They are named img_size_1.csv to approx img_size_1000.csv This answer is close but assumes a list file. ...
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4answers
980 views

How do I get a single total of lines with `wc -l`?

I've added a git alias to give me the line counts of specific files in my history: [alias] lines = !lc() { git ls-files -z ${1} | xargs -0 wc -l; }; lc However, wc -l is reporting multiple totals, ...
0
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1answer
226 views

Order a list of files, by date modified, then unzip them in that order

I have a list of zip files, that must be extracted by date modified, they contain updated images and the strange way the local mls provides them means that newer zip files container newer versions of ...
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3answers
97 views

What does xargs do if it's used without any parameter?

[user@notebook ~] echo -e '1\n2\n3\n4' 1 2 3 4 [user@notebook ~] echo -e '1\n2\n3\n4' | xargs 1 2 3 4 [user@notebook ~] My question: So xargs removes the newlines if it's used without parameters?
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1answer
64 views

Memory-efficient utility to return N first sorted values

I would like to implement a very popular MapReduce example using only existing programs operating in a UNIX way. The problem is to find N most frequent values in an enormous amount of data. The ...
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2answers
364 views

How to loop through xargs where each script uses a common env variable

Is it possible to initiate 10 of the same shell scripts which also initiate more copies, and have them all use the same env variable? For example: script.sh: #!/bin/bash export ...
2
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1answer
257 views

ENV variables in relation to xargs loops

Are env variables (set using export) treated differently when the same script is run multiple times simultaneously? That's a weird question, so here's an example I built out which is similar to my ...
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2answers
424 views

Use xargs input in eval command [duplicate]

I have a file "commands.php" that dynamically generates bash commands. For example, one line is: # - commands.php ssh me@123.123.123.123 echo "text" > file; reboot; How can I use the output of ...
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2answers
2k views

xargs loop with input variable for use in multi-command

I have a text file with various IP addresses. I would like to cycle through each, and issue a command: cat ips.txt | xargs -L 1 `ssh me@__IP__ echo "text" > file; reboot;` But I'm unsure how ...
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2answers
4k views

Is there any way to use xargs across a pipe?

I'm trying to automatically convert flac files moved to a folder into mp3 in another folder. My current line of code is this: inotifywait -m -r -q -e moved_to --format "'%w%f'" ~/test | xargs -I x ...
2
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2answers
232 views

Understanding -regex with GNU find

Background I have what I think should be a simple case. I want to find all files with "cisco" in the name and do something with those files (via xargs). Finding files with ls Before I use xargs, ...
4
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3answers
324 views

cycle through one command's output and use in another command [duplicate]

How can I use the output of one command - line-by-line - into another command? I know how to do this with the | pipe symbol, but this uses the entire output in one command. I would like to go line by ...
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2answers
407 views

xargs inside a for loop

So we got most of it figured out but here's what happens. for i in $(arp |sort |awk '{print $1}'|grep IPADDRESS) do ssh USERNAME@$i "ps -ef |grep X11|grep -v grep |awk '{print $2}'|xargs kill" done ...
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3answers
1k views

Weird “No such file” error with “xargs” and “file”

I'd like to get the MIME type of all files under the current directory. Why doesn't this work? I've tested bash on OSX or Linux. "file" complains that it can't find the file, but if I run it with the ...
2
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2answers
315 views

Use xargs to move files from within a directory

I am searching for some folders in my current directory. What I want to do is, move all the files within those directories to another directory. I am using the following command: find -maxdepth 1 ...
0
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2answers
630 views

Pass flags to xargs

I want to kill a bunch of processes using this command: sudo ps ax | grep node | awk '{print $1}' | xargs kill But it gives me operation not permitted even with sudo. Then I tried with kill -9 ...
4
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2answers
2k views

Make xargs pass as first parameter

I'm trying to produce this behaviour: grep 192.168.1 *.txt By passing a string into grep via Xargs but it is going on the end instead of as the first parameter. echo 192.168.1 | xargs grep *.txt ...
2
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4answers
847 views

Zgrep stop after first match when arguments are passed from xargs

I'm using this command to find patterns in zip files (similar to the one) suggested here http://superuser.com/questions/144926/unix-grep-for-a-string-within-all-gzip-files-in-all-subdirectories find ...
2
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2answers
7k views

How can I find files and then use xargs to move them?

I want to find some files and then move them. I can find the file with: $ find /tmp/ -ctime -1 -name x* I tried to move them to my ~/play directory with: $ find /tmp/ -ctime -1 -name x* | xargs ...
3
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1answer
324 views

Why is `xargs bash -ic echo` not the same thing as `xargs echo` or `xargs`?

I expect the command ls -d doc/* | grep -P "<some_pattern>" | xargs bash -ic echo to do the same as: ls -d doc/* | grep -P "<some_pattern>" | xargs echo that is, to give me the files ...
5
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4answers
442 views

Format output of xargs

I would like to change the format of the output xargs displays cat k.txt 1 2 3 And cat k.txt | xargs 1 2 3 However I would like to have 1, 2, 3 or 1|2|3. Any suggestions?
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1answer
592 views

What is the purpose of xargs -I command?

I'm Unix noob, can you explain what this command does: files=(this_is_filename) for filename in ${files[@]}; do ls -t1 ../htory/$filename* | head -1 | xargs -I fname cp -p fname ...
4
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2answers
89 views

Why is the default choice for -I argument '{}'?

It seems you can pass in a variable name like 'file' for -I argument of xargs, but there are a plethora of examples that use {}. Is this because of the backward compatibility? Or does it help with the ...
5
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3answers
360 views

Can you pipe to a .bash_profile function?

I received a great function for highlighting files in Apple's finder using the command-line. It's basically a wrapper for osascript. I got it from Mac OS X: How to change the color label of files ...
2
votes
1answer
176 views

xargs and < and > to the same files

I want to run git stripspace on all my source code files, on each build (or precommit or just manually), to remove extraneous whitespace, and later maybe to format the code in a standard way, So ...
9
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2answers
6k views

find + xargs: argument line too long

I have a line like the following: find /foo/bar -name '*.mp4' -print0 | xargs -i {} -0 mv -t /some/path {} but I got the following error: xargs: argument line too long I am confused. Isn't the ...
4
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2answers
6k views

Moving files with find + xargs: target is not a directory?

When I run the following command: > mkdir some_dir > find /foo/bar/ -name '*.csv' -print0 | xargs -0 mv {} some_dir I get hundreds of lines that say: mv: target `/foo/bar/XX.csv` is not a ...
3
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1answer
154 views

xargs -r0 vs xargs -0

I have seen examples on the web of xargs with the argument -r0. What does this argument mean? My man pages don't show any entries for -r0 nor do most man pages I have seen (e.g. ...
2
votes
1answer
56 views

Change some ASP code to PHP code in all files

I'm migrating a directory of files containing fairly simple ASP code over to a PHP server and I need to modify the contents of all the files with a find and replace mechanism. I'm not great with ...
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3answers
1k views

`grep -l .. | xargs vim` generates a warning, why? [duplicate]

If I run a command like grep -rl test . | xargs vim I get a warning "Vim: Warning: Input is not from a terminal." But I am still able to edit the files. Why the warning?
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3answers
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Concatenating thousands of files: > vs >>

I found two seemingly contradictory answers on StackOverflow to the following questions: Concatenating Thousands of Text Files Across Hundreds of Directories (while keeping some structure) How do I ...
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1answer
490 views

How to do `head` and `tail` on null-delimited input in bash?

find command can output names of files as a null-delimited strings (if -print0 is provided), and xargs can consume them with -0 option turned on. But in between, it's hard to manipulate that ...
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3answers
2k views

find . .[^.]* -type f -print0 | xargs -0 sudo chmod 664; does not work

I am using this command to set permissions for files recursively clime@vm6879 /srv/www-php/steeltrading $ find . .[^.]* -type f -print0 | xargs -0 sudo chmod 664 But after executing that command ...
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1answer
225 views

Wrong behavior of xargs

I was trying to solve this issue using find + xargs but I stuck with another issue I am try to increasing a count using ((a++)) but not working . I have tried couple of combination of counting a ...
0
votes
1answer
327 views

Can someone provide an xargs example piping mysql query data into another command?

Can someone provide an example for the command xargs? I want to do a mysql query to return the ID field of a column then feed that result into xargs into another command say mysql query delete. How ...
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3answers
2k views

`solaris + xargs command for solaris

the command find /tmp -name 'core*' -type f -print0 | xargs -0 works fine on Linux, but xargs -0 option is not legal on Solaris what is the equivalent option ( xargs? ) for Solaris 10 second ...
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3answers
348 views

How to copy a list of files and adjust destination filenames on the fly?

When I don't need to adjust destination filenames I can do something like this: $ find -type f -name '*.pat' -print0 | xargs -O cp -t /path/to/dest It is safe because the filenames may even ...