Add findpid.sh and waiton.sh tools

2 files changed, 57 insertions, 0 deletions

diff --git a/unix/findpid.sh b/unix/findpid.sh
new file mode 100755
index 0000000..9ecd0dc
--- /dev/null
+++ b/unix/findpid.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+#
+# Find the PID of a command in UNIX
+# Jon Cairns
+# http://blog.joncairns.com/2013/03/finding-the-process-id-pid-of-a-command-in-unix/
+# 2018-03-20
+#
+
+me="${0##*/}"
+if [ $# -lt 1 ]; then
+    echo "$me: a grep expression for filtering processes required" >&2
+    exit 1
+fi
+
+output=$(ps auxww | grep "$*" | grep -v grep | grep -v $0)
+lines=$(echo "$output" | wc -l)
+
+if [ $lines -gt 1 ]; then
+    echo "$me: multiple processes matching the expression: '$*'" >&2
+    echo
+    echo "$output" >&2
+    exit 2
+elif [ -z "$output" ]; then
+    echo "$me: no processes matching the expression: '$*'" >&2
+    exit 3
+fi
+
+echo "$output" | awk '{ print $2 }'
diff --git a/unix/waiton.sh b/unix/waiton.sh
new file mode 100755
index 0000000..67d88ac
--- /dev/null
+++ b/unix/waiton.sh
@@ -0,0 +1,29 @@
+#!/bin/sh
+#
+# Wait for a UNIX process to finish
+# Jon Cairns
+# http://blog.joncairns.com/2013/03/wait-for-a-unix-process-to-finish/
+# 2013-03-20
+#
+
+case "$1" in
+    -h|--help|"")
+        echo "usage: ${0##*/} <pid>" >&2
+        exit 1
+        ;;
+esac
+
+pid="$1"
+me="${0##*/}($$)"
+name=$(ps -p ${pid} -o comm=)
+if [ $? -eq 0 ]; then
+    echo "${me}: waiting for process (${pid}, ${name}) to finish ..."
+    while ps -p ${pid} >/dev/null 2>&1; do
+        echo -n .
+        sleep 1
+    done
+    echo
+else
+    echo "${me}: failed to find process with PID ${pid}" >&2
+    exit 2
+fi