From 14f0bffe259736ff6be724acf449a87514bdbb40 Mon Sep 17 00:00:00 2001
From: Ole Tange <ole@tange.dk>
Date: Sat, 29 Jun 2019 18:07:35 +0200
Subject: [PATCH] pidcmd: Show the command running under a given pid.

---
 Makefile          |  8 +++---
 pidcmd/pidcmd     | 70 +++++++++++++++++++++++++++++++++++++++++++++++
 tracefile/test.sh | 19 +++++++++++++
 3 files changed, 93 insertions(+), 4 deletions(-)
 create mode 100755 pidcmd/pidcmd
 create mode 100644 tracefile/test.sh

diff --git a/Makefile b/Makefile
index c030bfa..2c09015 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 CMD = blink bsearch burncpu duplicate-packets em encdir field forever	\
 	G gitnext gitundo goodpasswd histogram mtrr mirrorpdf neno	\
-	off pdfman plotpipe puniq ramusage rand rclean rina rn rrm	\
-	shython sound-reload stdout swapout T timestamp tracefile	\
+	off pdfman pidcmd plotpipe puniq ramusage rand rclean rina rn	\
+	rrm shython sound-reload stdout swapout T timestamp tracefile	\
 	transpose upsidedown vid w4it-for-port-open wifi-reload wssh	\
 	ytv yyyymmdd
 
@@ -9,8 +9,8 @@ all: blink/blink.1 bsearch/bsearch.1 burncpu/burncpu.1			\
 	encdir/encdir.1 G/G.1 gitnext/gitnext.1 gitundo/gitundo.1	\
 	goodpasswd/goodpasswd.1 histogram/histogram.1			\
 	mirrorpdf/mirrorpdf.1 neno/neno.1 off/off.1 pdfman/pdfman.1	\
-	plotpipe/plotpipe.1 puniq/puniq.1 rand/rand.1 rina/rina.1	\
-	rn/rn.1 rrm/rrm.1 shython/shython.1				\
+	pidcmd/pidcmd.1 plotpipe/plotpipe.1 puniq/puniq.1 rand/rand.1	\
+	rina/rina.1 rn/rn.1 rrm/rrm.1 shython/shython.1			\
 	sound-reload/sound-reload.1 stdout/stdout.1			\
 	timestamp/timestamp.1 tracefile/tracefile.1			\
 	transpose/transpose.1 T/T.1 upsidedown/upsidedown.1 vid/vid.1	\
diff --git a/pidcmd/pidcmd b/pidcmd/pidcmd
new file mode 100755
index 0000000..8331908
--- /dev/null
+++ b/pidcmd/pidcmd
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+: <<=cut
+=pod
+
+=head1 NAME
+
+pidcmd - Show the command run by a pid
+
+
+=head1 SYNOPSIS
+
+B<pidcmd> I<pid>
+
+
+=head1 DESCRIPTION
+
+B<pidcmd> show the command run by a pid. It is a bit similar to:
+
+  ps aux | grep pid
+
+but it avoid false positives (if I<pid> matches a part of another
+line).
+
+
+=head1 EXAMPLE
+
+Show the command for pid 1
+
+  pidcmd 1
+
+
+
+=head1 AUTHOR
+
+Copyright (C) 2019 Ole Tange,
+http://ole.tange.dk and Free Software Foundation, Inc.
+
+
+=head1 LICENSE
+
+Copyright (C) 2012 Free Software Foundation, Inc.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3 of the License, or
+at your option any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+=head1 DEPENDENCIES
+
+B<pidcmd> uses B</proc/*/cmdline>.
+
+
+=head1 SEE ALSO
+
+B<ps>
+
+
+=cut
+
+cat /proc/$1/cmdline | xargs -0
diff --git a/tracefile/test.sh b/tracefile/test.sh
new file mode 100644
index 0000000..b23e267
--- /dev/null
+++ b/tracefile/test.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+doit() {
+    opt="$1"
+    file="$2"
+    sudo tracefile $opt dd if=/dev/zero of="$file" bs=1000k count=10
+    sudo tracefile $opt chmod 600 $file
+    sudo tracefile $opt mkswap $file
+    sudo tracefile $opt swapon $file
+    sudo tracefile $opt swapoff $file
+    sudo rm "$file"
+}
+export -f doit
+
+# Test 2 char dir
+mkdir -p tt/tt
+parallel -vj1 doit \
+	 ::: '' -l -u \
+	 ::: tt/tt/../tt/test.img `pwd`/tt/tt/../tt/test.img | grep test.img