Put existing functionality into 'list' verb

scsictl

@@ -1,35 +1,25 @@
 #!/bin/sh
 
-# GET THE INITITAL OUTPUT OF `ls /sys/block`
-BLK_INFO="$(ls -l --color=never /sys/block | grep -v virtual | grep devices | sed 's/  \+/ /g' | cut -d\  -f9-)"
-
-# STRIP OFF THE PCI BUS LOCATION INFORMATION
-BLK_INFO="$(echo "${BLK_INFO}" | sed 's|\.\.\/devices/pci[0-9a-f:]\{7\}\(/[0-9a-f:.]\{12\}\)\+/||g')"
-
-# STRIP OFF THE SUPERFLUOUS USB HOST INFORMATION
-BLK_INFO="$(echo "${BLK_INFO}" | sed 's|\(usb[0-9]\+\)/.*/host|\1/host|g')"
-
-# STRIP OFF THE SUPERFLUOUS HOST AND TARGET INFORMATION
-BLK_INFO="$(echo "${BLK_INFO}" | sed 's|/host[0-9]\+/target\([0-9]\+\):\([0-9]\+\):\([0-9]\+\)/|/|g')"
-
-# NORMALIZE NVME INFO
-BLK_INFO="$(echo "${BLK_INFO}" | sed 's|nvme/nvme\([0-9]\+\)/nvme\([0-9]\+\)n\([0-9]\+\)|nvme/N:\2:\3:1|g')"
-
-# STRIP OFF BLOCKS
-BLK_INFO="$(echo "${BLK_INFO}" | sed 's|/block/.*||g')"
-
-# CONVERT -> TO A SPACE
-BLK_INFO="$(echo "${BLK_INFO}" | sed 's/ -> / /g')"
-
-# CONVERT / TO A SPACE
-BLK_INFO="$(echo "${BLK_INFO}" | sed 's|/| |g')"
-
-# SWAP COLUMNS
-# BLK_INFO="$(echo "${BLK_INFO}" | awk '{t=$1; $1=$2; $2=t; print;}')"
-
-# NOW GET DEVICE IDs and SIZES
-
-echo "${BLK_INFO}" | while read -r BLOCKDEV DEV_PORT DEV_HCIL; do
+case "${1}" in
+  list)
+    # GET THE INITITAL OUTPUT OF `ls /sys/block`
+    BLK_INFO="$(ls -l --color=never /sys/block | grep -v virtual | grep devices | sed 's/  \+/ /g' | cut -d\  -f9-)"
+    # STRIP OFF THE PCI BUS LOCATION INFORMATION
+    BLK_INFO="$(echo "${BLK_INFO}" | sed 's|\.\.\/devices/pci[0-9a-f:]\{7\}\(/[0-9a-f:.]\{12\}\)\+/||g')"
+    # STRIP OFF THE SUPERFLUOUS USB HOST INFORMATION
+    BLK_INFO="$(echo "${BLK_INFO}" | sed 's|\(usb[0-9]\+\)/.*/host|\1/host|g')"
+    # STRIP OFF THE SUPERFLUOUS HOST AND TARGET INFORMATION
+    BLK_INFO="$(echo "${BLK_INFO}" | sed 's|/host[0-9]\+/target\([0-9]\+\):\([0-9]\+\):\([0-9]\+\)/|/|g')"
+    # NORMALIZE NVME INFO
+    BLK_INFO="$(echo "${BLK_INFO}" | sed 's|nvme/nvme\([0-9]\+\)/nvme\([0-9]\+\)n\([0-9]\+\)|nvme/N:\2:\3:1|g')"
+    # STRIP OFF BLOCKS
+    BLK_INFO="$(echo "${BLK_INFO}" | sed 's|/block/.*||g')"
+    # CONVERT -> TO A SPACE
+    BLK_INFO="$(echo "${BLK_INFO}" | sed 's/ -> / /g')"
+    # CONVERT / TO A SPACE
+    BLK_INFO="$(echo "${BLK_INFO}" | sed 's|/| |g')"
+    # NOW GET DEVICE IDs and SIZES
+    echo "${BLK_INFO}" | while read -r BLOCKDEV DEV_PORT DEV_HCIL; do
       DEVICE_ID="$(ls -l --color=never /dev/disk/by-id | sed 's/  \+/ /g' | grep -v 'nvme-eui\|wwn-' | grep "${BLOCKDEV}$" | cut -d\  -f9)"
       DEV_BYTES="$(lsblk -bnPo NAME,SIZE | grep "\"${BLOCKDEV}\"" | cut -d\" -f 4)"
       if [ "${DEV_BYTES}" -ge $((1000**5)) ]; then
@@ -46,7 +36,9 @@ echo "${BLK_INFO}" | while read -r BLOCKDEV DEV_PORT DEV_HCIL; do
         DEVICE_SZ="${DEV_BYTES}B"
       fi
       echo "${DEV_HCIL} ${DEV_PORT} ${BLOCKDEV} ${DEVICE_SZ} ${DEVICE_ID}" >> /tmp/bdmap
-done
-
-column -N H:C:I:L,PORT,DEV,SIZE,NAME -t -R2,4 -o"   " /tmp/bdmap
-rm /tmp/bdmap
+    done
+    column -N H:C:I:L,PORT,DEV,SIZE,NAME -t -R2,4 -o"   " /tmp/bdmap
+    rm /tmp/bdmap
+    ;;
+  *) echo "Unknown verb '${1}' -- expected delete, list, or rescan"; exit 1;;
+esac