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.TH "apptainer" "1" "Jun 2025" "Auto generated by spf13/cobra" ""

.SH NAME
apptainer-sign - Add digital signature(s) to an image


.SH SYNOPSIS
\fBapptainer sign [sign options...] \fP


.SH DESCRIPTION
The sign command allows a user to add one or more digital signatures to a SIF
  image. By default, one digital signature is added for each object group in
  the file.

.PP
Key material can be provided via PEM-encoded file, or an entity in the PGP
  keyring. To manage the PGP keyring, see 'apptainer help key'.


.SH OPTIONS
\fB-g\fP, \fB--group-id\fP=0
	sign objects with the specified group ID

.PP
\fB-h\fP, \fB--help\fP[=false]
	help for sign

.PP
\fB--key\fP=""
	path to the private key file

.PP
\fB-k\fP, \fB--keyidx\fP=0
	PGP private key to use (index from 'key list --secret')

.PP
\fB-i\fP, \fB--sif-id\fP=0
	sign object with the specified ID


.SH EXAMPLE
.EX

  Sign with a private key:
  $ apptainer sign --key private.pem container.sif

  Sign with PGP:
  $ apptainer sign container.sif
.EE


.SH SEE ALSO
\fBapptainer(1)\fP


.SH HISTORY
29-Jun-2025 Auto generated by spf13/cobra