Merge pull request #701 from nthapaliya/zsh_script_improvements

[zsh] GNU coreutils compatibility

shell/completion.zsh

@@ -44,7 +44,7 @@ __fzf_generic_path_completion() {
   setopt localoptions nonomatch
   dir="$base"
   while [ 1 ]; do
-    if [ -z "$dir" -o -d ${~dir} ]; then
+    if [[ -z "$dir" || -d ${~dir} ]]; then
       leftover=${base/#"$dir"}
       leftover=${leftover/#\/}
       [ -z "$dir" ] && dir='.'
@@ -111,7 +111,7 @@ _fzf_complete_telnet() {
 
 _fzf_complete_ssh() {
   _fzf_complete '+m' "$@" < <(
-    cat <(cat ~/.ssh/config /etc/ssh/ssh_config 2> /dev/null | command grep -i '^host' | command grep -v '*') \
+    command cat <(cat ~/.ssh/config /etc/ssh/ssh_config 2> /dev/null | command grep -i '^host' | command grep -v '*') \
         <(command grep -oE '^[^ ]+' ~/.ssh/known_hosts | tr ',' '\n' | awk '{ print $1 " " $1 }') \
         <(command grep -v '^\s*\(#\|$\)' /etc/hosts | command grep -Fv '0.0.0.0') |
         awk '{if (length($2) > 0) {print $2}}' | sort -u