migrated more functions

.bash.d/functions.sh

@@ -44,6 +44,26 @@ hr(){
     echo "# ============================================================================ #"
 }
 
+repeat(){
+    local i n
+    n="$1"
+    shift
+    if [ -z "$n" ]; then
+        echo "usage: repeat N command args"
+        return 1
+    fi
+    for ((i=1; i <= n; i++)); do
+        "$@"
+    done
+}
+
+loop(){
+    while true; do
+        eval "${*//\$/\\$}"
+        sleep 1
+    done
+}
+
 topcommands(){
     # first awk print $2 but my advanced history records `date '+%F %T'` in between number and command for $2 and $3, making command $4
     history |
@@ -83,6 +103,12 @@ f(){
     eval find -L . -type f "$grep"
 }
 
+add_etc_host(){
+    local host_line="$*"
+    $sudo grep -q "^$host_line" /etc/hosts ||
+    $sudo echo "$host_line" >> /etc/hosts
+}
+
 vihosts(){
     [ $EUID -eq 0 ] && sudo="" || sudo=sudo
     $sudo vim /etc/hosts