ltt-armall: head -1 is deprecated, replace by head -n 1

[ltt-control.git] / lttctl / ltt-armall.sh

diff --git a/lttctl/ltt-armall.sh b/lttctl/ltt-armall.sh
index 7771505f6d3d494d2cf401191f0060ad3630d1a5..9b740d1cfd9b0e7dc85112f79000a8ae18ccccbc 100755 (executable)
--- a/lttctl/ltt-armall.sh
+++ b/lttctl/ltt-armall.sh
@@ -1,4 +1,3 @@
-#!/bin/bash
 # Copyright (C) 2009 Benjamin Poirier
 
 # This program is free software; you can redistribute it and/or modify
@@ -15,7 +14,7 @@
 # with this program; if not, write to the Free Software Foundation, Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-DEBUGFSROOT=$(grep ^debugfs /proc/mounts | head -1 | awk '{print $2}')
+DEBUGFSROOT=$(grep ^debugfs /proc/mounts | head -n 1 | awk '{print $2}')
 MARKERSROOT=${DEBUGFSROOT}/ltt/markers
 
 usage () {
@@ -31,18 +30,18 @@ usage () {
        echo "" > /dev/stderr
 }
 
-if [ ! "$DEBUGFSROOT" ]; then
+if [ ! "${DEBUGFSROOT}" ]; then
        echo "Error: debugfs not mounted" > /dev/stderr
        exit 1;
 fi
 
-if [ ! -d "$MARKERSROOT" ]; then
+if [ ! -d "${MARKERSROOT}" ]; then
        echo "Error: LTT trace controller not found (did you compile and load LTTng?)" > /dev/stderr
        exit 1;
 fi
 
 while getopts "lnqh" options; do
-       case $options in
+       case ${options} in
                l) LOCKING="0";;
                n) NETWORK="0";;
                q) QUIET="0";;
@@ -52,20 +51,20 @@ while getopts "lnqh" options; do
                        exit 1;;
        esac
 done
-shift $(($OPTIND - 1))
+shift $((${OPTIND} - 1))
 
 
-if [ ! $LOCKING ]; then
+if [ ! ${LOCKING} ]; then
        TESTS="${TESTS} -name lockdep -prune -o -name locking -prune -o"
 fi
 
-if [ ! $NETWORK ]; then
+if [ ! ${NETWORK} ]; then
        TESTS="${TESTS} -path '*/net/*_extended' -prune -o"
 fi
 
-while read -r -d $'\0' marker; do
-       if [ ! $QUIET ]; then
+(eval "find '${MARKERSROOT}' ${TESTS} -name metadata -prune -o -name enable -print0") | while read -r -d $'\0' marker; do
+       if [ ! ${QUIET} ]; then
                echo "Connecting ${marker%/enable}"
        fi
-       echo 1 > $marker
-done < <(eval "find '$MARKERSROOT' $TESTS -name metadata -prune -o -name enable -print0")
+       echo 1 > ${marker}
+done