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Very nice. Named pipes are not so cool, but now we have full control over the job (I guess that's not so easy with process substitution)

Thanks Alister!

Hi!



Thanks, those are good solutions. However, the grep in my code was just an example, let's imagine you cannot change how the stream is generated:

stream_generator | head -n1

By the...

Here is an example code that shows the issue I have:


#!/bin/bash
counter() {
seq 1000 | while read NUM; do
echo $NUM
echo "debug: $NUM" >&2
sleep 0.1 # slow it down so we...

Script to run it N times. You get the idea for the 4/20 times scenario.


#!/bin/bash
TIMES=$1
cd "$SWDIR/util"
for((i=0; i < TIMES; i++)); do
./swadm add_process 1 BG Y
done


$...

Absolutely.

Actually, I have this tr command aliased (lineto0) but I didn't remember it.

The -d option is used to set the delimiter between fields. If your xargs does not have this option, you can omit it; it will work fine except for filenames with spaces

Yes, (tacit) initial assumption was that we don't have newlines in our data domain. That should cover most scenarios (why UNIX allowed newlines in filenames, I'll never know).

You are connecting to the server for each file, this is slooooow; you should connect only one time. There are lots of ways of doing it, that's one:

ssh server ls remotedir | ( cd localdir && xargs...

Hey, that's a good idea, use cat to join multiple argument sources.



That's right, xargs works perfectly when inserting arguments at the end of the command.



That would work in my...

Unless really necessary, I think it's better to avoid "eval" approaches, it can get tricky (i.e. you have to worry about escaping quotes).

Hello there,

Let me show you a simple example of what I am trying to achieve:

1) I have an input text file with some lines:

1 a
2 b
3 c

2) And I want to run a command with these lines...

Hi,

This seems to be a recurrent problem on mailing lists and bug reports, but I've been unable to find a solution. Let's imagine we have this bash script:

#!/bin/bash
set -e

fun() {
...

Thanks for your reply. I see two problems, though:

- You build by hand the pairs to rename, and this should be automatic. That's why I use paste, to simulate a zip function found in some scripting...

This is possibly a FAQ, but I was unable to find an answer: let's say you have two files named "hello.txt" and "goodbye.txt" and you want them to be "hi.txt" and "seeyou.txt". The typical regular...

Yes, I'm aware of this, it was just an example.



Certaintly. A pure bash solution (less versatile as it does not use xargs) I though was as simple as:

#!/bin/sh
COMMAND=$1
while read LINE;...

Hi,

The thing is that sometimes I need to filter an arbitrary output given a condition (think on the "filter" function present on some programming languages) from the shell (I use sh/bash). I...