diff --git a/src/psij/launchers/scripts/aprun_launch.sh b/src/psij/launchers/scripts/aprun_launch.sh
index bd586ade..6f3e5dbf 100644
--- a/src/psij/launchers/scripts/aprun_launch.sh
+++ b/src/psij/launchers/scripts/aprun_launch.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-source $(dirname "$0")/launcher_lib.sh
+source "${0%/*}/launcher_lib.sh"
 
 _PSI_J_PROCESS_COUNT="$1"
 shift
@@ -8,7 +8,7 @@ shift
 pre_launch
 
 set +e
-aprun -n $_PSI_J_PROCESS_COUNT "$@" 1>$_PSI_J_STDOUT 2>$_PSI_J_STDERR <$_PSI_J_STDIN
+aprun -n "$_PSI_J_PROCESS_COUNT" "$@" 1>"$_PSI_J_STDOUT" 2>"$_PSI_J_STDERR" <"$_PSI_J_STDIN"
 _PSI_J_EC=$?
 set -e
 
@@ -16,4 +16,4 @@ log "Command done: $_PSI_J_EC"
 
 post_launch
 
-exit $_PSI_J_EC
+exit "$_PSI_J_EC"
diff --git a/src/psij/launchers/scripts/jsrun_launch.sh b/src/psij/launchers/scripts/jsrun_launch.sh
index 80fdcff4..4aca56ec 100755
--- a/src/psij/launchers/scripts/jsrun_launch.sh
+++ b/src/psij/launchers/scripts/jsrun_launch.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-source $(dirname "$0")/launcher_lib.sh
+source "${0%/*}/launcher_lib.sh"
 
 _PSI_J_PROCESS_COUNT="$1"
 shift
@@ -8,7 +8,7 @@ shift
 pre_launch
 
 set +e
-jsrun -p $_PSI_J_PROCESS_COUNT --np 1 "$@" 1>$_PSI_J_STDOUT 2>$_PSI_J_STDERR <$_PSI_J_STDIN
+jsrun -p "$_PSI_J_PROCESS_COUNT" --np 1 "$@" 1>"$_PSI_J_STDOUT" 2>"$_PSI_J_STDERR" <"$_PSI_J_STDIN"
 _PSI_J_EC=$?
 set -e
 
@@ -16,4 +16,4 @@ log "Command done: $_PSI_J_EC"
 
 post_launch
 
-exit $_PSI_J_EC
+exit "$_PSI_J_EC"
diff --git a/src/psij/launchers/scripts/launcher_lib.sh b/src/psij/launchers/scripts/launcher_lib.sh
index ac83cd5b..cb755b5e 100755
--- a/src/psij/launchers/scripts/launcher_lib.sh
+++ b/src/psij/launchers/scripts/launcher_lib.sh
@@ -1,12 +1,26 @@
 set -e
 
+# abspath Source - https://stackoverflow.com/a/23002317
+# Posted by Alexander Klimetschek, modified by community. See post 'Timeline' for change history
+# Retrieved 2026-03-26, License - CC BY-SA 3.0
+
+function _psi_j_abspath() {
+    if [[ $1 = /* ]]; then
+        echo "$1"
+    elif [[ $1 == */* ]]; then
+        echo "$(cd "${1%/*}"; pwd)/${1##*/}"
+    elif [ -n "$1" ]; then
+        echo "$(pwd)/$1"
+    fi
+}
+
 _PSI_J_JOB_ID="$1"
-_PSI_J_LOG_FILE="$2"
-_PSI_J_PRE_LAUNCH="$3"
-_PSI_J_POST_LAUNCH="$4"
-_PSI_J_STDIN="$5"
-_PSI_J_STDOUT="$6"
-_PSI_J_STDERR="$7"
+_PSI_J_LOG_FILE=$(_psi_j_abspath "$2")
+_PSI_J_PRE_LAUNCH=$(_psi_j_abspath "$3")
+_PSI_J_POST_LAUNCH=$(_psi_j_abspath "$4")
+_PSI_J_STDIN=$(_psi_j_abspath "$5")
+_PSI_J_STDOUT=$(_psi_j_abspath "$6")
+_PSI_J_STDERR=$(_psi_j_abspath "$7")
 
 shift 7
 
@@ -14,12 +28,23 @@ if [ "$_PSI_J_LOG_FILE" == "" ]; then
     _PSI_J_LOG_FILE="/dev/null"
 fi
 
-ts() {
-    while read LINE; do
-        TZ=UTC TS=`date '+%Y-%m-%d %H:%M:%S'`
-        echo "$TS $_PSI_J_JOB_ID $LINE"
-    done
-}
+if [ "${BASH_VERSINFO[0]}" -gt 4 ] || { [ "${BASH_VERSINFO[0]}" -eq 4 ] && [ "${BASH_VERSINFO[1]}" -ge 2 ]; }; then
+    ts() {
+        local TZ=UTC
+        while read LINE; do
+            printf -v TS '%(%Y-%m-%d %H:%M:%S)T' -1
+            echo "$TS $_PSI_J_JOB_ID $LINE"
+        done
+    }
+else
+    ts() {
+        local TZ=UTC
+        while read LINE; do
+            TS=$(date '+%Y-%m-%d %H:%M:%S')
+            echo "$TS $_PSI_J_JOB_ID $LINE"
+        done
+    }
+fi
 
 log() {
     echo "$@" >&3
diff --git a/src/psij/launchers/scripts/mpi_launch.sh b/src/psij/launchers/scripts/mpi_launch.sh
index b23222db..445cb852 100644
--- a/src/psij/launchers/scripts/mpi_launch.sh
+++ b/src/psij/launchers/scripts/mpi_launch.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-source $(dirname "$0")/launcher_lib.sh
+source "${0%/*}/launcher_lib.sh"
 
 _PSI_J_PROCESS_COUNT="$1"
 shift
@@ -27,13 +27,13 @@ filter_out_5() {
 
 set +e
 if [ "$IS_OPENMPI_5" == "1" ]; then
-    mpirun --oversubscribe --output TAG -n $_PSI_J_PROCESS_COUNT "$@" \
-        1> >(filter_out_5 > $_PSI_J_STDOUT) 2> >(filter_out_5 > $_PSI_J_STDERR) <$_PSI_J_STDIN
+    mpirun --oversubscribe --output TAG -n "$_PSI_J_PROCESS_COUNT" "$@" \
+        1> >(filter_out_5 > "$_PSI_J_STDOUT") 2> >(filter_out_5 > "$_PSI_J_STDERR") <"$_PSI_J_STDIN"
 elif [ "$IS_OPENMPI" == "1" ]; then
-    mpirun --oversubscribe --tag-output -q -n $_PSI_J_PROCESS_COUNT "$@" \
-        1> >(filter_out > "$_PSI_J_STDOUT") 2> >(filter_out > $_PSI_J_STDERR) <$_PSI_J_STDIN
+    mpirun --oversubscribe --tag-output -q -n "$_PSI_J_PROCESS_COUNT" "$@" \
+        1> >(filter_out > "$_PSI_J_STDOUT") 2> >(filter_out > "$_PSI_J_STDERR") <"$_PSI_J_STDIN"
 else
-    mpirun -n $_PSI_J_PROCESS_COUNT "$@" 1>$_PSI_J_STDOUT 2>$_PSI_J_STDERR <$_PSI_J_STDIN
+    mpirun -n "$_PSI_J_PROCESS_COUNT" "$@" 1>"$_PSI_J_STDOUT" 2>"$_PSI_J_STDERR" <"$_PSI_J_STDIN"
 fi
 _PSI_J_EC=$?
 set -e
@@ -42,4 +42,4 @@ log "Command done: $_PSI_J_EC"
 
 post_launch
 
-exit $_PSI_J_EC
+exit "$_PSI_J_EC"
diff --git a/src/psij/launchers/scripts/multi_launch.sh b/src/psij/launchers/scripts/multi_launch.sh
index 2c9f3213..e2f0664d 100644
--- a/src/psij/launchers/scripts/multi_launch.sh
+++ b/src/psij/launchers/scripts/multi_launch.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-source $(dirname "$0")/launcher_lib.sh
+source "${0%/*}/launcher_lib.sh"
 
 pre_launch
 
@@ -9,8 +9,8 @@ _PSI_J_PROCESS_COUNT="$1"
 shift
 export _PSI_J_PROCESS_COUNT
 
-for INDEX in $(seq 1 1 $_PSI_J_PROCESS_COUNT); do
-    _PSI_J_PROCESS_INDEX_=$INDEX "$@" 1>>$_PSI_J_STDOUT 2>>$_PSI_J_STDERR  <$_PSI_J_STDIN &
+for INDEX in $(seq 1 1 "$_PSI_J_PROCESS_COUNT"); do
+    _PSI_J_PROCESS_INDEX_=$INDEX "$@" 1>>"$_PSI_J_STDOUT" 2>>"$_PSI_J_STDERR"  <"$_PSI_J_STDIN" &
     PIDS="$PIDS $!"
 done
 
diff --git a/src/psij/launchers/scripts/single_launch.sh b/src/psij/launchers/scripts/single_launch.sh
index 88e5d235..52558671 100644
--- a/src/psij/launchers/scripts/single_launch.sh
+++ b/src/psij/launchers/scripts/single_launch.sh
@@ -1,11 +1,11 @@
 #!/bin/bash
 
-source $(dirname "$0")/launcher_lib.sh
+source "${0%/*}/launcher_lib.sh"
 
 pre_launch
 
 set +e
-"$@" 1>$_PSI_J_STDOUT 2>$_PSI_J_STDERR  <$_PSI_J_STDIN
+"$@" 1>"$_PSI_J_STDOUT" 2>"$_PSI_J_STDERR"  <"$_PSI_J_STDIN"
 _PSI_J_EC=$?
 set -e
 log "Command done: $_PSI_J_EC"
diff --git a/src/psij/launchers/scripts/srun_launch.sh b/src/psij/launchers/scripts/srun_launch.sh
index d0ac39ca..3fcb0f4e 100644
--- a/src/psij/launchers/scripts/srun_launch.sh
+++ b/src/psij/launchers/scripts/srun_launch.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-source $(dirname "$0")/launcher_lib.sh
+source "${0%/*}/launcher_lib.sh"
 
 _PSI_J_PROCESS_COUNT="$1"
 shift
@@ -8,7 +8,7 @@ shift
 pre_launch
 
 set +e
-srun "$@" 1>$_PSI_J_STDOUT 2>$_PSI_J_STDERR <$_PSI_J_STDIN
+srun "$@" 1>"$_PSI_J_STDOUT" 2>"$_PSI_J_STDERR" <"$_PSI_J_STDIN"
 _PSI_J_EC=$?
 set -e
 
diff --git a/tests/plugins1/_batch_test/test/launcher.sh b/tests/plugins1/_batch_test/test/launcher.sh
index 13a188ed..bba3dfbd 100644
--- a/tests/plugins1/_batch_test/test/launcher.sh
+++ b/tests/plugins1/_batch_test/test/launcher.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-source $(dirname "$0")/launcher_lib.sh
+source "${0%/*}/launcher_lib.sh"
 
 pre_launch
 
@@ -18,20 +18,20 @@ export _PSI_J_PPN
 EXECUTABLE="$1"
 shift
 if [ "$EXECUTABLE" == "/bin/hostname" ]; then
-    EXECUTABLE=$(dirname "$0")/hostname
+    EXECUTABLE="${0%/*}/hostname"
 fi
 
 log "Running stuff"
-log "STDOUT: $_PSI_J_STDOUT"
-log "STDERR: $_PSI_J_STDERR"
+log "STDOUT: \"$_PSI_J_STDOUT\""
+log "STDERR: \"$_PSI_J_STDERR\""
 
-for NODE in $(seq 1 1 $_PSI_J_NODE_COUNT); do
+for NODE in $(seq 1 1 "$_PSI_J_NODE_COUNT"); do
     log "Node: $NODE"
-    for NODE_PROC in $(seq 1 1 $_PSI_J_PPN); do
+    for NODE_PROC in $(seq 1 1 "$_PSI_J_PPN"); do
         log "Node proc: $NODE_PROC"
         INDEX=$(($NODE * $_PSI_J_PPN + $NODE_PROC))
         log "Index: $INDEX"
-        _PSI_J_NODE_INDEX_=$NODE _PSI_J_PROCESS_INDEX_=$INDEX "$EXECUTABLE" "$@" 1>>$_PSI_J_STDOUT 2>>$_PSI_J_STDERR  <$_PSI_J_STDIN &
+        _PSI_J_NODE_INDEX_=$NODE _PSI_J_PROCESS_INDEX_=$INDEX "$EXECUTABLE" "$@" 1>>"$_PSI_J_STDOUT" 2>>"$_PSI_J_STDERR"  <"$_PSI_J_STDIN" &
         PIDS="$PIDS $!"
     done
 done
diff --git a/tests/test_nodefile.sh b/tests/test_nodefile.sh
index f061d5ee..4eed9f47 100755
--- a/tests/test_nodefile.sh
+++ b/tests/test_nodefile.sh
@@ -8,7 +8,7 @@ if [ "$EXPECTED_N_NODES" == "" ]; then
     exit 3
 fi
 
-ACTUAL_N_NODES=`cat "$PSIJ_NODEFILE" | wc -l`
+ACTUAL_N_NODES=$(wc -l < "$PSIJ_NODEFILE" | tr -d ' ')
 
 if [ "$EXPECTED_N_NODES" != "$ACTUAL_N_NODES" ]; then
     echo "Invalid node file. Expected $EXPECTED_N_NODES nodes, but got $ACTUAL_N_NODES."