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.TH "SYD\-LS" "1" "2026\-09\-01"
.PP
.SH NAME
.PP
\fBsyd\-ls\fR \- List unsafe directories, capabilities, system calls, environment variables, ioctl requests, personalities, and prctl options
.PP
.SH SYNOPSIS
.PP
\fBsyd\-ls\fR \fI[set]\fR
.PP
.SH DESCRIPTION
.PP
The \fBsyd\-ls\fR utility prints the names of the system calls which belong
to the given set.\& Available sets are \fBaio\fR, \fBcpu\fR, \fBdead\fR, \fBdeny\fR,
\fBebpf\fR, \fBfutex\fR, \fBhook\fR, \fBnice\fR, \fBnoop\fR, \fBpkey\fR, \fBptrace\fR, \fBsafe\fR,
\fBsetid\fR, \fBtime\fR, and \fBuring\fR.\&
.PP
If set is \fBdrop\fR, \fBsyd\-ls\fR prints the list of Linux \fIcapabilities\fR(7) that are
dropped at startup.\&
.PP
If set is \fBenv\fR, \fBsyd\-ls\fR prints the list of unsafe environment variables.\&
.PP
If set is \fBioctl\fR, \fBsyd\-ls\fR prints the list of allowed ioctl requests.\&
.PP
If set is \fBprctl\fR, \fBsyd\-ls\fR prints the list of allowed prctl options.\&
.PP
If set is \fBpersonality\fR, \fBsyd\-ls\fR prints the list of allowed personalities.\&
.PP
Given no set, \fBsyd\-ls\fR lists all files in the current working directory.\&
In this mode, getdents64(2) is used directly.\& Use to list files in
untrusted directories with huge number of files.\& File names are printed
hex\-encoded, delimited by newline, use \fIsyd\-hex\fR(1) to decode.\& See
EXAMPLES section for more information.\&
.PP
.SH EXAMPLES
.PP
.nf
.RS 4
[alip@caissa tmp]$ mkdir test; cd test
[alip@caissa test]$ for i in {1\&.\&.10000000}; do :>$i; done
[alip@caissa test]$ df \-i \&.
Filesystem       Inodes    IUsed IFree IUse% Mounted on
tmpfs          10048576 10000228 48348  100% /tmp
[alip@caissa test]$ syd\-ls | head \-n5 | syd\-hex \-dfs
\&.
\&.\&.
10000000
9999999
9999998
[alip@caissa test]$ for ls in syd\-ls gls 9ls \&'busybox ls\&'; do
> sync
> sudo sh \-c \&'echo 3 > /proc/sys/vm/drop_caches\&'
> echo "[*] $ls"
> time $ls >/dev/null
> done
[*] syd\-ls
syd\-ls: Listed 10000002 files in 2\&.882764582 seconds\&.

real    0m2\&.889s
user    0m0\&.883s
sys     0m1\&.995s
[*] gls

real    0m7\&.548s
user    0m5\&.724s
sys     0m1\&.803s
[*] 9ls

real    0m15\&.306s
user    0m2\&.523s
sys     0m12\&.743s
[*] busybox ls

real    0m18\&.011s
user    0m11\&.178s
sys     0m6\&.786s
[alip@caissa test]$ gls \-\-version | head \-n1
ls (GNU coreutils) 9\&.6
[alip@caissa test]$ pacman \-Ss 9base | head \-n1
extra/9base 6\-9 [installed]
[alip@caissa test]$ busybox | head \-n1
BusyBox v1\&.36\&.1 () multi\-call binary\&.
.fi
.RE
.PP
.SH SEE ALSO
.PP
\fIsyd\fR(1), \fIsyd\fR(2), \fIsyd\fR(5), \fIsyd\-hex\fR(1), \fIgetdents\fR(2)
.PP
\fBsyd\fR homepage: https://sydbox.\&exherbo.\&org/
.PP
.SH AUTHORS
.PP
Maintained by Ali Polatel.\& Up\-to\-date sources can be found at
https://gitlab.\&exherbo.\&org/sydbox/sydbox.\&git and on Radicle at
rad:z38HCnbmcDegA2BMxuPaPRPMdp6wF.\& Bugs/patches can be submitted to
https://gitlab.\&exherbo.\&org/groups/sydbox/\-/issues.\& Discuss in #sydbox on Libera
Chat or in #sydbox:mailstation.\&de on Matrix.\&