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Don't Put Tilde In Your Path

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Hacker News | Oct 11, 2026 | arusekk

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I was playing with the nono agent sandboxing tool and it greeted me with a warning: PATH entries the sandbox can write to: ~/. local/bin/ which looked suspicious. In other words, doing this in your ~/. bashrc or ~/. zshrc: If a word begins with an unquoted tilde character (‘~’), all of the characters up to the first unquoted slash (…) are considered a tilde-prefix. (…) Bash checks each variable assignment for unquoted tilde-prefixes immediately following a ‘:’ or the first ‘=’, and performs tilde expansion in these cases. (…) Note that the unquoted version export PATH=$PATH:~/.

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