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I've been trying to implement this on a single line with pipes but I haven't been able to do it. I would appreciate if you could help me out.

This is my code:

#!/bin/bash

subdir=$(find $1 -type d)  

for ft in $subdir
do
    nFiles=$(find $ft -maxdepth 1 -type f | wc -l)
    echo $ft $nFiles
done

exit 0

This is what I tried to do but it's not working:

find $directori -type d -exec find {} -maxdepth 1 -type f \; | wc -l

Like this:

find "${1}" -type d -exec bash -c 'echo "${1} $(find "${1}" -maxdepth 1 -type f -printf "." | wc -c)"' -- {}  \;

Is it possible to write a computer program in one line?, You can write any program in one line on almost all of the languages, that said, you definitely won't f = lambda l: reduce(lambda z, x: z + [y + [x] for y in z], l, [[]]). Specifically, the output of a single map() call is a single key-value pair. The Hadoop infrastructure performs a sort and merge operation on all those key-value pairs to produce a set of one or more partitions. When a call to reduce is made, it is made with all the values for a given key.

the | is handle by the shell which redirects the output and input of the involved commands.

It cannot be used directly within the -exec ..., because find does not propose such feature.

It is possible to use -print0 to avoid that filenames with special chars break the command.

This sentence can be read from the echo - open group issue 7 page:

New applications are encouraged to use printf instead of echo.

Give a try to this (EDIT see @CharlesDuffy's comment):

find "${directori}" -type d -print0 | xargs -0 sh -c 'for ft ; do printf "%s " "${ft}" ; find "${ft}" -maxdepth 1 -type f -printf "\n" | wc -l ; done' sh

The final sh is used to set $0 see the man sh.

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Here's another option with pipes, I find it more readable:

find $1 -type d | while IFS='' read -r ft; do nFiles=$(find $ft -maxdepth 1 -type f | wc -l); echo $ft $nFiles; done; exit 0

You could also avoid to assign nFiles:

find $1 -type d | while IFS='' read -r ft; do echo "$ft $(find $ft -maxdepth 1 -type f | wc -l)"; done; exit 0

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Comments
  • What do you mean its not working? What is the find command returning then?
  • I'd argue that requests to make something a one-liner are not "practical" questions in the sense used in stackoverflow.com/help/dont-ask. Code written for practical purposes should value readability, maintainability, and correctness in corner cases; all of these things get compromised when making something a one-liner is considered paramount.
  • You might consider _ as a conventional placeholder for the dummy value in $0 -- either that, or sh (so error messages read as sh: yadda yadda yadda, rather than dummy: yadda yadda yadda).
  • @CharlesDuffy : thank you ! good idea, I chose sh. Never thought about the error messages... (super remark)
  • If you don't use -print0 | while IFS='' read -r -d '' ft, filenames with literal newlines will throw you off. Similarly, there's missing quoting here that shellcheck.net will catch.