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.TH "HISTCLEAN" "1" "2026-06-30" "" "General Commands Manual"
.P
.SH NAME
.P
histclean - clean shell history file
.P
.SH SYNOPSIS
.P
\fBhistclean\fR [options]
.P
.SH DESCRIPTION
.P
Clean duplicate shell commands from history files in-place, while
preserving the most recent unique occurrence of each command.\&
.P
.SH OPTIONS
.P
\fB-h\fR, \fB--help\fR
.RS 4
Show help message and exit.\&
.P
.RE
\fB-v\fR, \fB--version\fR
.RS 4
Show version and exit.\&
.P
.RE
\fB-d\fR, \fB--dry-run\fR
.RS 4
Print the resulted output to stdout without modifying anything.\&
.P
.RE
\fB-b\fR, \fB--backup\fR
.RS 4
Create a .\&backup copy of the history file before modifying it.\&
.P
.RE
\fB-w\fR, \fB--which-file\fR
.RS 4
Print the path to the detected history file and exit.\&
.P
.RE
\fB-i\fR, \fB--input\fR <FILE>
.RS 4
Read history from <file> instead of the default shell
history file (determined by $HISTFILE).\&
.P
.RE
\fB-o\fR, \fB--output\fR <FILE>
.RS 4
Write resulted output to the specified <file> instead of overwriting
the input file.\&
Running the command multiple times to the same \fBoutput\fR will overwrite
it.\&
.P
.RE
\fB-s\fR, \fB--shell\fR <SHELL>
.RS 4
Override the shell type instead of auto-detecting from \fB$SHELL\fR.\&
See \fBSUPPORTED SHELLS\fR below for available shells.\&
.P
.RE
\fB-c\fR, \fB--completion\fR <SHELL>
.RS 4
Generate completion script for the specified shell.\&
See \fBSUPPORTED SHELLS\fR below for available shells.\&
.P
.RE
.SH SUPPORTED SHELLS
.P
\fB bash
\fR zsh
.P
.SH ENVIRONMENT
.P
\fBHISTFILE\fR
.RS 4
Path to the shell history file.\& Must be set or provided via
\fB--input\fR.\&
.P
.P