individual checksum files

files/hash-update

@@ -9,6 +9,7 @@ Usage:
   -c check
   -t hash-type defaults to sha256. choose from md5, sha1, sha256, sha512 etc..
   -f list_name is [type]sums.txt by default
+  -i individual [filename].[hash] files, instead of -f list of files.
   If files to check omitted, list files in current folder
 
   Check files with "sha256sum -c sha256sums.txt", or passing -c to this script.
@@ -30,6 +31,7 @@ function valid_type() {
 recursive=0
 check=0
 hashtype=sha256
+individual=0
 
 paths=()
 for ((i=1; i<=${#@}; i++)) {
@@ -38,6 +40,7 @@ for ((i=1; i<=${#@}; i++)) {
     [[ "${!i}" = "--help" ]] && helpexit
     [[ "${!i}" = "-r" ]] && { recursive=1; continue; }
     [[ "${!i}" = "-c" ]] && { check=1; continue; }
+    [[ "${!i}" = "-i" ]] && { individual=1; continue; }
     [[ "${!i}" = "-t" ]] && { hashtype="${!j}"; i=$(( $i + 1 )); continue; }
     [[ "${!i}" = "-f" ]] && { list_name="${!j}"; i=$(( $i + 1 )); continue; }
     paths+=("${!i}")
@@ -67,9 +70,23 @@ if [[ ${#paths[@]} -eq 0 ]]; then
 fi
 which pv &>/dev/null && PVBIN=$( which pv )
 set -e
-echo "Updating: $list_name"
-test -f "$list_name" || touch "$list_name"
+if [[ $individual = 0 ]]; then
+  echo "Updating: $list_name"
+  test -f "$list_name" || touch "$list_name"
+fi
 updates_done=0
+_add_single() {
+    size=$( stat -c %s "$1" )
+    if [[ $size -gt 100000000 ]] && [[ -n "$PVBIN" ]]; then
+        # Use pv is size > 100MB
+        touch "$2"
+        sum=$( $PVBIN "$1" | $SUMBIN | awk '{ print $1 }' )
+        printf "%s  %s\n" "$sum" "$1" >> "$2"
+    else
+        $SUMBIN "$1" >> "$2"
+    fi
+}
+
 _update() {
     if [ "$1" = "$list_name" ]; then
         return
@@ -82,19 +99,24 @@ _update() {
         echo "$1 is a directory"
         return
     fi
+    # individual checksum files
+    if [[ $individual = 1 ]]; then
+        if [[ "$1" = *.$hashtype ]]; then
+            return
+        fi
+        if [[ -e "$1.$hashtype" ]]; then
+            return
+        fi
+        _add_single "$1" "$1.$hashtype"
+        return
+    fi
+    # sum list file
     if test -f "$1"; then
         if sed 's,^[^ ]\+  ,,' "$list_name" | grep -qFx "$1"; then
             echo "Exists: $1"
         else
             echo "New:    $1"
-            size=$( stat -c %s "$1" )
-            if [[ $size -gt 100000000 ]] && [[ -n "$PVBIN" ]]; then
-                # Use pv is size > 100MB
-                sum=$( $PVBIN "$1" | $SUMBIN | awk '{ print $1 }' )
-                printf "%s  %s\n" "$sum" "$1" >> "$list_name"
-            else
-                $SUMBIN "$1" >> "$list_name"
-            fi
+            _add_single "$1" "$list_name"
             updates_done=1
         fi
     fi