tac
A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Many more text utilities, from tac and rev to comm and numfmt, are now recognized as file-reading commands.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.257.
In the changelogs
3Releases whose published page names tac.
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v2.1.271
Bash permission-matcher flag parsing expanded for more coreutils commands
Bash permission checks now recognize far more real flags for tac, fold, expand, fmt, comm, cmp, pr and other text utilities
found in this entry's text
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v2.1.257
Bash tool file-reading verb list greatly expanded
Many more text utilities, from tac and rev to comm and numfmt, are now recognized as file-reading commands.
found in this entry's text
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v2.1.257
More read-only commands allowed for the sandboxed/permission-checked Bash tool
The sandboxed bash read-only allowlist now covers many more text utilities such as tac, rev, comm and numfmt.
found in this entry's text
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the settings key does. All settings keys.