diff --git a/snippets/boinc.sh b/snippets/boinc.sh
index dd231c9..0bdd267 100755
--- a/snippets/boinc.sh
+++ b/snippets/boinc.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 # sources:
 # - https://wiki.archlinux.org/?title=BOINC#Laptop_overheating_and_battery_duration_reduction
diff --git a/snippets/check port is reachable.sh b/snippets/check port is reachable.sh
index 2647f47..f1023e8 100644
--- a/snippets/check port is reachable.sh	
+++ b/snippets/check port is reachable.sh	
@@ -1,4 +1,4 @@
-#!sh
+#!/usr/bin/env sh
 
 # Sources:
 # - https://superuser.com/questions/621870/test-if-a-port-on-a-remote-system-is-reachable-without-telnet
diff --git a/snippets/diff.sh b/snippets/diff.sh
index 220ca38..c644c5a 100644
--- a/snippets/diff.sh
+++ b/snippets/diff.sh
@@ -1,4 +1,4 @@
-#!sh
+#!/usr/bin/env sh
 
 # Sources:
 # - https://stackoverflow.com/questions/8800578/how-to-colorize-diff-on-the-command-line
diff --git a/snippets/filesystems.sh b/snippets/filesystems.sh
index 0b00334..9be55c8 100644
--- a/snippets/filesystems.sh
+++ b/snippets/filesystems.sh
@@ -1,4 +1,4 @@
-#/usr/bin/env sh
+#!/usr/bin/env sh
 
 # Get the *sector* size of partitions in 512-byte sectors
 sudo blockdev --getsz '/dev/nvme0n1p1'
diff --git a/snippets/functions.sh b/snippets/functions.sh
index 6d80252..b0520c5 100644
--- a/snippets/functions.sh
+++ b/snippets/functions.sh
@@ -1,4 +1,4 @@
-#!sh
+#!/usr/bin/env sh
 
 is_strictly_false () {
 	if [[ "$1" =~ '0|^[Ff][Aa][Ll][Ss][Ee]$|^[Nn][Oo]?$|^$' ]]
diff --git a/snippets/sed.sh b/snippets/sed.sh
index 1364173..9eddaf2 100644
--- a/snippets/sed.sh
+++ b/snippets/sed.sh
@@ -1,4 +1,4 @@
-#!sh
+#!/usr/bin/env sh
 
 # Quote whatever is not a space.
 sed -E 's|([[:graph:]]+)|"\1"|g'
diff --git a/snippets/ssh.sh b/snippets/ssh.sh
index 1b1f811..b6539f2 100644
--- a/snippets/ssh.sh
+++ b/snippets/ssh.sh
@@ -1,3 +1,3 @@
 #!/usr/bin/env sh
 
-eval `ssh-agent` && ssh-add
+eval $(ssh-agent) && ssh-add
diff --git a/snippets/view files.sh b/snippets/view files.sh
index 418ae90..0314840 100644
--- a/snippets/view files.sh	
+++ b/snippets/view files.sh	
@@ -1,4 +1,4 @@
-#!sh
+#!/usr/bin/env sh
 
 # Just `vim` but read-only.
 view 'file'