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Posts by alx‭

21 posts
75%
+4 −0
Q&A How to extract string from file, run filter, and replace in file with new value?

(Assuming your file names are portable, according to POSIX (https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_282). If not, please read this for writing a more robust...

posted 5mo ago by alx‭  ·  edited 5mo ago by alx‭

Answer
71%
+3 −0
Q&A Why/how can distro support lifetimes exceed the lifetime of their dependencies (such as Python)?

When an upstream project stops supporting a version (e.g., Python stops supporting 3.8), the maintainers of the distribution do the job of supporting those components, applying security patches as ...

posted 26d ago by alx‭  ·  edited 24d ago by alx‭

Answer
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Q&A Can a malicious party add false recipients (who are listed but can't really decrypt) to an encrypted GPG message?

In gpg(1), one normally adds recipients of an encrypted message with --recipient. Those recipients will be able to decrypt the message, and their key ID will appear unencrypted, so anyone will kno...

0 answers  ·  posted 27d ago by alx‭  ·  edited 26d ago by alx‭

Question GPG
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+3 −0
Q&A How to overwrite each line of STDOUT with the next one?

I wrote a filter program to overwrite each line with the next one. $ cat /usr/local/bin/ovr #!/bin/sh sed '2,$s/^/\x1B[1A\x1B[K/'; Here's the behavior: $ echo | ovr $ echo 'foo' | ovr ...

3 answers  ·  posted 7mo ago by alx‭  ·  last activity 7mo ago by Kamil Maciorowski‭

Question terminal
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+3 −0
Q&A How to RTFM well to get a CLI command

The pager less(1) less(1) is the usual pager nowadays; you would do well learning to use it. It's also used for paging the manual pages, in most systems. The most common operation is searching,...

posted 5mo ago by alx‭  ·  edited 5mo ago by alx‭

Answer
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Q&A Looking for a way to sync dotfile content between different machines without introducing security issues

It depends on how much sensitive they are. I have three classes. 1) Very sensitive directories Partitions For my ~/.ssh/, ~/.password-store/, ~/.gnupg/, and ~/.abook/, I have a drive with 4 p...

posted 6mo ago by alx‭  ·  edited 4mo ago by alx‭

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+3 −0
Q&A How can I restrict filename characters?

You could try and convince Linux kernel maintainers, but they are reticent to that. I wonder what they'll do after POSIX.1-202x (Issue 8) possibly will forbid those. Maybe you could patch your ke...

posted 6mo ago by alx‭  ·  edited 6mo ago by alx‭

Answer
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+2 −0
Q&A How to see all header fields of an email in mutt?

Neomutt (and probably Mutt too, but I didn't try) seems to be hiding header fields from email, such as the Message-ID field, and fields that are added by SMTP servers when they receive the message....

1 answer  ·  posted 7mo ago by alx‭  ·  edited 7mo ago by matthewsnyder‭

Question neomutt mutt
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+2 −0
Q&A Run pipeline in the background from git hook

I'm trying to run a pipeline to update a PDF after every push to the 'main' branch. I want it to be atomic, so it doesn't touch the existing PDF until it has finished, so I need to use sponge(1) (...

1 answer  ·  posted 5mo ago by alx‭  ·  last activity 5mo ago by alx‭

Question shell-scripting git
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+2 −0
Q&A How to run a command on a list of files?

In some cases, when you want to apply a pipeline or a complex command to each file, I find it useful to use while read: find . -type d \ | while read d; do find $d -type f -maxdepth 1 \ | hea...

posted 6mo ago by alx‭  ·  edited 6mo ago by alx‭

Answer
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+1 −0
Q&A Rename multiple files which have a variable suffix

find . -type f -print0 \ | grep -z -- '-min.jpg-[[:alnum:]]*$' \ | while IFS= read -r -d '' f; do find "$f" -print0 \ | sed -z 's/-min.jpg-[[:alnum:]]*$/-min.jpg/' \ | xargs -0 mv ...

posted 6mo ago by alx‭  ·  edited 6mo ago by alx‭

Answer
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+1 −0
Q&A How to use the gitignore file without git(1).

How can a file list be manually filtered with a gitignore file. I want to do the equivalent of git ls-files, but it should work even if I remove .git, so I can't use git(1). Currently, I'm doing ...

1 answer  ·  posted 2mo ago by alx‭  ·  last activity 2mo ago by r~~‭

60%
+1 −0
Q&A Who creates subdirs under `/run`?

A system daemon needs to create several files under /run/program-name/ (and possibly other subdirs of that). They are the PID file, and at least one Unix socket file (but maybe more). The FHS spe...

1 answer  ·  posted 1y ago by alx‭  ·  edited 1y ago by alx‭

Question unix /run
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+2 −1
Q&A How to change resolution of virtual terminal?

How can I rescale the Linux virtual terminals (ctrl + alt + {f1, f2, f3, f4, f5, f6}), so that a high-resolution display doesn't make the letters too small? I'd like to use 1080 or even 720 resolu...

2 answers  ·  posted 6mo ago by alx‭  ·  last activity 6mo ago by Canina‭

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Q&A How to identify and separate standalone applications from libraries in Linux package lists?

This answer is not directly usable under Arch, since I don't know the tools there. I show you a way to do it on Debian, which may inspire you to find a similar way in Arch. With apt-file(1), you ...

posted 7mo ago by alx‭  ·  edited 7mo ago by alx‭

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Q&A How to list the first x files in each directory

Here's my approach: find l1 -type d \ | while read d; do find $d -maxdepth 1 -type f \ | head -n3; done; If your middle directories also contain files, it will also show them (of course, ...

posted 7mo ago by alx‭  ·  edited 7mo ago by alx‭

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+0 −0
Q&A How to overwrite each line of STDOUT with the next one?

Instead of having new stdout lines overwrite the previous one, it seems better to specify that old stdout lines should be overwritten by anything that comes after them. This has the benefit that s...

posted 7mo ago by alx‭  ·  edited 7mo ago by alx‭

Answer
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Q&A Ergonomic way to search man pages

Unix filters are quite handy. First of all, you can get an index of any manual page with a simple grep(1): $ man pacman | grep '^[^ ]' PACMAN(8) Pacman Manual ...

posted 7mo ago by alx‭  ·  edited 7mo ago by alx‭

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Q&A How to get a mailto: URI out of abook(1)

There's no such feature. But it's easy to write. Apply this patch: From 8ea7d1cf4933ca24006308ac61aa50fb8ab33b02 Mon Sep 17 00:00:00 2001 From: Alejandro Colomar <alx@kernel.org> Date: S...

posted 7mo ago by alx‭  ·  edited 7mo ago by alx‭

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Q&A Run pipeline in the background from git hook

Use nohup(1), and redirect stdout and stderr to /dev/null The following works as expected, not having to wait until the PDF is generated. #!/bin/sh test "$1" = "refs/heads/main" || exit 0; ...

posted 5mo ago by alx‭  ·  edited 5mo ago by alx‭

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Q&A How to get a mailto: URI out of abook(1)

I store my address book with abook(1). https://manpages.debian.org/bookworm/abook/abook.1.en.html Let's say I want to introduce some contact in some field that accepts the usual name <email&gt...

1 answer  ·  posted 7mo ago by alx‭  ·  last activity 7mo ago by alx‭

Question abook mailto