diff --git a/init/completions/kill.fish b/init/completions/kill.fish
index 46627457c..8e5f7013b 100644
--- a/init/completions/kill.fish
+++ b/init/completions/kill.fish
@@ -7,7 +7,7 @@ if kill -L ^/dev/null >/dev/null
 
 	complete -c kill -s L -d "List codes and names of available signals"
 
-	set -- signals (kill -L | sed -r 's/([0-9]+) +([A-Z,0-9]+)/\1 \2\n/g;s/ +/ /g' | sed 's/^ //' | grep -E '^[^ ]+')
+	set -- signals (kill -L | sed -e 's/\([0-9][0-9]*\)  *([A-Z,0-9][A-Z,0-9]*\)/\1 \2\n/g;s/ +/ /g' | sed -e 's/^ //' | grep -E '^[^ ]+')
 	for i in $signals
 		set -- number (echo $i | cut -d " " -f 1)
 		set -- name (echo $i | cut -d " " -f 2)
diff --git a/init/completions/make.fish b/init/completions/make.fish
index 2b932cda4..7427fdebc 100644
--- a/init/completions/make.fish
+++ b/init/completions/make.fish
@@ -2,7 +2,7 @@
 
 function __fish_print_make_targets
 	set files Makefile makefile GNUmakefile
-	grep -h -E '^[^#%=$[:space:]][^#%=$]*:([^=]|$)' $files | cut -d ":" -f 1 | sed -r 's/^ *//;s/ *$//;s/ +/\n/g' ^/dev/null
+	grep -h -E '^[^#%=$[:space:]][^#%=$]*:([^=]|$)' $files | cut -d ":" -f 1 | sed -e 's/^ *//;s/ *$//;s/  */\n/g' ^/dev/null
 end
 
 complete -x -c make -a "(__fish_print_make_targets)" -d "Target"
diff --git a/init/completions/modprobe.fish b/init/completions/modprobe.fish
index 1b0395ecf..566d00b6b 100644
--- a/init/completions/modprobe.fish
+++ b/init/completions/modprobe.fish
@@ -2,7 +2,7 @@
 # Completions for the modprobe command
 #
 
-complete -c modprobe -d Module -a "(/sbin/modprobe -l | sed -re 's/\/.*\/([^\/.]*).*/\1/')"
+complete -c modprobe -d Module -a "(/sbin/modprobe -l | sed -e 's/\/.*\/\([^\/.]*\).*/\1/')"
 complete -c modprobe -s v -l verbose -d "Print messages about what the program is doing"
 complete -c modprobe -s C -l config -d "Configuration file" -r
 complete -c modprobe -s c -l showconfig -d "Dump configuration file"
diff --git a/init/completions/umount.fish b/init/completions/umount.fish
index 489a392bd..4ba33a8d9 100644
--- a/init/completions/umount.fish
+++ b/init/completions/umount.fish
@@ -10,7 +10,7 @@ complete -y mount
 #
 # Find all mountpoints
 #
-complete -c umount -d "Mount point" -x -a '(cat /etc/mtab | cut -d " " -f 1-2|tr " " \n|sed -re "s/[0-9\.]*:\//\//"|grep "^/")'
+complete -c umount -d "Mount point" -x -a '(cat /etc/mtab | cut -d " " -f 1-2|tr " " \n|sed -e "s/[0-9\.]*:\//\//"|grep "^/")'
 
 complete -c umount -s V -d "Display version and exit"
 complete -c umount -s h -d "Display help and exit"
diff --git a/init/fish_function.fish b/init/fish_function.fish
index c49b17129..1ba63bb1e 100644
--- a/init/fish_function.fish
+++ b/init/fish_function.fish
@@ -218,9 +218,9 @@ end
 
 function prompt_pwd -d "Print the current working directory, shortend to fit the prompt"
 	set -l wd (pwd)
-	printf "%s" $wd|sed -re 's-/([^/])([^/]*)-/\1-g'
+	printf "%s" $wd|sed -e 's-/\([^/]\)\([^/]*\)-/\1-g'
 	if test $wd != '~'
-		printf "%s\n" $wd|sed -re 's-.*/[^/]([^/]*$)-\1-'
+		printf "%s\n" $wd|sed -e 's-.*/[^/]\([^/]*$\)-\1-'
 	end
 end
 
@@ -229,7 +229,7 @@ end
 #
 
 function pwd -d "Print working directory"
-	command pwd | sed -re "s|^$HOME|~|"
+	command pwd | sed -e "s|^$HOME|~|"
 end
 
 #
@@ -661,7 +661,7 @@ function trap -d 'Perform an action when the shell recives a signal'
 			if count $opt >/dev/null
 				set -- names $opt
 			else
-				set -- names (functions -na|grep "^__trap_handler_"|sed -re 's/__trap_handler_//' )
+				set -- names (functions -na|grep "^__trap_handler_"|sed -e 's/__trap_handler_//' )
 			end
 
 			for i in $names