Reworked install / uninstall

Hardened scripts a little, made them more distro agnostic

scripts/99fix-opera

@@ -1,2 +1,2 @@
 DPkg::Pre-Invoke {"stat -c %Z $(readlink -f $(which opera)) > /tmp/opera.timestamp  2> /dev/null || echo 0 > /tmp/opera.timestamp";};
-DPkg::Post-Invoke {"set NEW_OPERA=`stat -c %Z $(readlink -f $(which opera))` || exit 0; set OLD_OPERA=`cat /tmp/opera.timestamp` || exit 0; if [ "$NEW_OPERA" != "$OLD_OPERA" ]; then /root/.scripts/fix-opera.sh; fi; rm -f /tmp/opera.timestamp";};
+DPkg::Post-Invoke {"set NEW_OPERA=`stat -c %Z $(readlink -f $(which opera))` || exit 0; set OLD_OPERA=`cat /tmp/opera.timestamp` || exit 0; if [ "$NEW_OPERA" != "$OLD_OPERA" ]; then /root/.scripts/fix-opera.sh; fi; rm -f /tmp/opera.timestamp";};

scripts/fix-opera.action

@@ -1 +1 @@
-opera-stable:in:/root/.scripts/fix-opera.sh
+opera-stable:in:/root/.scripts/fix-opera.sh

scripts/fix-opera.hook

@@ -13,4 +13,4 @@ Depends = bash
 Depends = curl
 Depends = unzip
 Depends = jq
-Exec = /root/.scripts/fix-opera.sh
+Exec = /root/.scripts/fix-opera.sh

scripts/fix-opera.sh

@@ -10,22 +10,22 @@ if [[ $(uname -m) != "x86_64" ]]; then
 	exit 1
 fi
 
-if ! which unzip > /dev/null; then
+if command -v unzip > /dev/null; then
 	printf '\033[1munzip\033[0m package must be installed to run this script\n'
 	exit 1
 fi
 
-if ! which curl > /dev/null; then
+if command -v curl > /dev/null; then
 	printf '\033[1mcurl\033[0m package must be installed to run this script\n'
 	exit 1
 fi
 
-if ! which jq > /dev/null; then
+if command -v jq > /dev/null; then
 	printf '\033[1mjq\033[0m package must be installed to run this script\n'
 	exit 1
 fi
 
-if which pacman &> /dev/null; then
+if command -v pacman &> /dev/null; then
 	ARCH_SYSTEM=true
 fi
 
@@ -136,4 +136,4 @@ done
 
 #Removing temporary files
 printf 'Removing temporary files...\n'
-rm -rf "$FIX_DIR"
+rm -rf "$FIX_DIR"