1 files changed, 0 insertions, 57 deletions
diff --git a/_tils/2021-01-17-posix-sh-and-shebangs.md b/_tils/2021-01-17-posix-sh-and-shebangs.md
deleted file mode 100644
index 938d1bd..0000000
--- a/_tils/2021-01-17-posix-sh-and-shebangs.md
+++ /dev/null
@@ -1,57 +0,0 @@
----
-
-title: POSIX sh and shebangs
-
-date: 2021-01-17
-
-layout: post
-
-lang: en
-
-ref: posix-sh-and-shebangs
-
----
-
-As I [keep moving][posix-awk-0] [towards POSIX][posix-awk-1], I'm on the process of migrating all my Bash scripts to POSIX sh.
-
-As I dropped `[[`, arrays and other Bashisms, I was left staring at the first line of every script, wondering what to do: what is the POSIX sh equivalent of `#!/usr/bin/env bash`?
-I already knew that POSIX says nothing about shebangs, and that the portable way to call a POSIX sh script is `sh script.sh`, but I didn't know what to do with that first line.
-
-What I had previously was:
-```shell
-#!/usr/bin/env bash
-set -Eeuo pipefail
-cd "$(dirname "${BASH_SOURCE[0]}")"
-```
-
-Obviously, the `$BASH_SOURCE` would be gone, and I would have to adapt some of my scripts to not rely on the script location.
-The `-E` and `-o pipefail` options were also gone, and would be replaced by nothing.
-
-I converted all of them to:
-```shell
-#!/bin/sh -eu
-```
-
-I moved the `-eu` options to the shebang line itself, striving for conciseness.
-But as I changed callers from `./script.sh` to `sh script.sh`, things started to fail.
-Some tests that should fail reported errors, but didn't return 1.
-
-My first reaction was to revert back to `./script.sh`, but the POSIX bug I caught is a strong strain, and when I went back to it, I figured that the callers were missing some flags.
-Specifically, `sh -eu script.sh`.
-
-Then it clicked: when running with `sh script.sh`, the shebang line with the sh options is ignored, as it is a comment!
-
-Which means that the shebang most friendly with POSIX is:
-
-```shell
-#!/bin/sh
-set -eu
-```
-
-1. when running via `./script.sh`, if the system has an executable at `/bin/sh`, it will be used to run the script;
-1. when running via `sh script.sh`, the sh options aren't ignored as previously.
-
-TIL.
-
-[posix-awk-0]: {% link _tils/2020-12-15-awk-snippet-shellcheck-all-scripts-in-a-repository.md %}
-[posix-awk-1]: {% link _tils/2021-01-12-awk-snippet-send-email-to-multiple-recipients-with-curl.md %}