diff --git a/README.md b/README.md
index f0a1d88..21e1454 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,8 @@
 - Force the removal of a pool with `./pool.sh remove-force <poolname>` all running processes will be killed and the pool will be deleted
 - Additional properties can be attach to processes with `./pool.sh setp <poolname> <procid> <propname> <propvalue>` Defaults properties are `<cmd>`,`<procpid>`,`<startat>`.
 - Properties can be retrieve with `./pool.sh getp <poolname> <procid> <propname>`
+- Processes in a pool can be paused with `./pool.sh pause <poolname>`
+- Processes in a pool can be resumed with `./pool.sh resume <poolname>`
 - Available pools can be retrieve with `./pool.sh ls`
 - All the processes output file can be retrieve with `./pool.sh ls-output <poolname>`
 
diff --git a/pool.sh b/pool.sh
index 9e97d86..7336545 100755
--- a/pool.sh
+++ b/pool.sh
@@ -30,7 +30,7 @@ write_status() {
 }
 
 create_properties() {
-    file="${POOL}/proc_${procid}"
+    local file="${POOL}/proc_${procid}"
     echo cmd=\"${PROC_CMD}\" > "$file"
     echo "procpid=${procpid}" >> "$file"
     echo "procid=${procid}" >> "$file"
@@ -38,19 +38,20 @@ create_properties() {
 }
 
 setp() {
-    file="${POOL}/proc_${procid}"
-    echo $1=$2 >> "$file"
+    local file="${POOL}/proc_${procid}"
+    sed -i "/${1}=/d" "$file"
+    echo $1=\"$2\" >> "$file"
 }
 
 getp() {
-    file="${POOL}/proc_${procid}"
-    source "$file"
-    echo "${!1}"
+    local file="${POOL}/proc_${procid}"
+    value=$(grep "^$1=" "$file"||:)
+    [ -z "$value" ] && echo  "Property $1 not found for process ${procid}" || { echo "$value" | sed "s/^$1=//" | xargs echo; }
 }
 
 
 create() {
-    [ -d "$POOL" ] && abort "Pool \"$POOL\" already exists"
+    [ -d "$POOL" ] && abort "Pool \"$POOL\" already exists" || :
     mkdir -p "$POOL"
     # Write pool status
     maxproc=$1
@@ -62,7 +63,7 @@ create() {
 
 remove() {
     refresh # Refresh process status and load status
-    [ $nproc -gt 0 ] && abort "Processes are still running in the pool!"
+    [ $nproc -gt 0 ] && abort "Processes are still running in the pool!" || :
     rm -rf "$POOL"
 }
 
@@ -94,7 +95,7 @@ run() {
     procid=$(( lastprocid + 1 ))
     lastprocid=$procid
     startat=$(date +"%s")
-    $PROC_CMD > "$POOL/out_$procid" &
+    $PROC_CMD &> "$POOL/out_$procid" &
     procpid=$!
     [ -z "$procs" ] && procs="$procpid" || procs="$procs $procpid"
     write_status # Update status
@@ -103,7 +104,7 @@ run() {
 }
 
 cat_output() {
-    file="${POOL}/out_${procid}"
+    local file="${POOL}/out_${procid}"
     cat "$file"
 }
 
@@ -134,8 +135,31 @@ remove_force() {
     rm -rf "$POOL"    
 }
 
-# Ensure pool exists
-[ ! "$CMD" == "create" ] && [ ! "$CMD" == "ls" ] && [ ! -d "$POOL" ] && abort "Pool $POOL_ID not found"
+check_pool() {
+    if [ ! -d "$POOL" ]; then abort "Pool ${POOL_ID} not found"; fi
+    if [ ! -f "$POOL_STATUS" ]; then abort "Pool ${POOL_ID} corrupted: status file not found"; fi
+    if [ $# -gt 0 ]
+    then
+        [ ! -f "${POOL}/proc_${1}" ] && echo abort "Process $1 does not exists in pool ${POOL_ID}" || :
+    fi
+}
+
+pause() {
+   refresh
+   for proc in $procs
+   do
+       kill -STOP $proc
+   done
+}
+
+resume() {
+   refresh
+   for proc in $procs
+   do
+       kill -CONT $proc
+   done
+}
+
 
 # Launch command
 case "$CMD" in
@@ -143,37 +167,54 @@ case "$CMD" in
         create $1
         ;;
     "remove")
+        check_pool
         remove
         ;;
     "run")
+        check_pool
         run
         ;;
     "cat")
+        check_pool $1
         procid=$1
         refresh
-        [ $procid -gt $lastprocid ] && abort "Processus $procid not found"
-        cat_output
+        [ $procid -gt $lastprocid ] && abort "Processus $procid not found" || cat_output
         ;;
     "ls-output")
+        check_pool
         list_output
         ;;
     "ls")
+        check_pool
         list_pool
         ;;
     "wait")
+        check_pool
         wait_pool
         ;;
     "remove-force")
+        check_pool
         remove_force
         ;;
     "setp")
+        check_pool $1
         procid=$1
         setp $2 $3
         ;;
     "getp")
+        check_pool $1
         procid=$1
         getp $2
         ;;
+    "pause")
+        check_pool
+        pause
+        ;;
+    "resume")
+        check_pool
+        resume
+        ;;
     *)
         abort "Command $CMD unknown"
 esac
+