From 8eda2266bc26d4abc81db48b9ce5a0d56a66ddea Mon Sep 17 00:00:00 2001
From: summer-wu <wushuyu90@hotmail.com>
Date: Wed, 7 Oct 2015 11:34:01 +0800
Subject: [PATCH 1/4] Create tr

---
 cheat/cheatsheets/tr | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 cheat/cheatsheets/tr

diff --git a/cheat/cheatsheets/tr b/cheat/cheatsheets/tr
new file mode 100644
index 0000000..b462467
--- /dev/null
+++ b/cheat/cheatsheets/tr
@@ -0,0 +1,21 @@
+#replace : with new line
+echo $PATH|tr ":" "\n" #equivalent to:
+echo $PATH|tr -t ":" \n 
+
+#complement "aa"
+echo aabbccd |tr -c "aa" 1
+#output: aa11111%
+#tip: Complement meaning keep aa,all other is replace with 1
+
+#complement "ab\n"
+echo aabbccd |tr -c "ab\n" 1
+#output: aabb111 with new line
+
+#preserve all alpha(-c),sequeeze mode instead of character mode
+echo $PATH|tr -cs "[:alpha:]" "\n" 
+
+#ordered list to unordered list
+echo "1 /usr/bin\n2 /bin" |tr -cs "/\n[:alpha:]" "+"
+
+#remove all occurance of "ab"
+echo aabbcc |tr -d "ab"

From 91c28712e6358d3f34f7e391d22655b5e61677d0 Mon Sep 17 00:00:00 2001
From: summer-wu <wushuyu90@hotmail.com>
Date: Wed, 7 Oct 2015 11:39:27 +0800
Subject: [PATCH 2/4] Update tr

---
 cheat/cheatsheets/tr | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cheat/cheatsheets/tr b/cheat/cheatsheets/tr
index b462467..c5efd47 100644
--- a/cheat/cheatsheets/tr
+++ b/cheat/cheatsheets/tr
@@ -1,5 +1,5 @@
 #replace : with new line
-echo $PATH|tr ":" "\n" #equivalent to:
+echo $PATH|tr ":" "\n" #equivalent with:
 echo $PATH|tr -t ":" \n 
 
 #complement "aa"
@@ -11,7 +11,7 @@ echo aabbccd |tr -c "aa" 1
 echo aabbccd |tr -c "ab\n" 1
 #output: aabb111 with new line
 
-#preserve all alpha(-c),sequeeze mode instead of character mode
+#Preserve all alpha(-c). ":-[:digit:] etc" will translate to "\n". sequeeze mode.
 echo $PATH|tr -cs "[:alpha:]" "\n" 
 
 #ordered list to unordered list

From 84df17a0f6ee3328119d622c1cdc6d1562809d74 Mon Sep 17 00:00:00 2001
From: summer-wu <wushuyu90@hotmail.com>
Date: Wed, 7 Oct 2015 21:14:45 +0800
Subject: [PATCH 3/4] fix some typo

---
 cheat/cheatsheets/tr | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/cheat/cheatsheets/tr b/cheat/cheatsheets/tr
index c5efd47..50f617f 100644
--- a/cheat/cheatsheets/tr
+++ b/cheat/cheatsheets/tr
@@ -2,20 +2,20 @@
 echo $PATH|tr ":" "\n" #equivalent with:
 echo $PATH|tr -t ":" \n 
 
+#remove all occurance of "ab"
+echo aabbcc |tr -d "ab"
+
 #complement "aa"
 echo aabbccd |tr -c "aa" 1
-#output: aa11111%
-#tip: Complement meaning keep aa,all other is replace with 1
+#output: aa11111 without new line
+#tip: Complement meaning keep aa,all others are replaced with 1
 
 #complement "ab\n"
 echo aabbccd |tr -c "ab\n" 1
 #output: aabb111 with new line
 
-#Preserve all alpha(-c). ":-[:digit:] etc" will translate to "\n". sequeeze mode.
+#Preserve all alpha(-c). ":-[:digit:] etc" will be translated to "\n". sequeeze mode.
 echo $PATH|tr -cs "[:alpha:]" "\n" 
 
 #ordered list to unordered list
-echo "1 /usr/bin\n2 /bin" |tr -cs "/\n[:alpha:]" "+"
-
-#remove all occurance of "ab"
-echo aabbcc |tr -d "ab"
+echo "1. /usr/bin\n2. /bin" |tr -cs " /[:alpha:]\n" "+"

From f3ecf76239e20309207737f72c1ac31bd7fb4b00 Mon Sep 17 00:00:00 2001
From: summer-wu <wushuyu90@hotmail.com>
Date: Wed, 7 Oct 2015 21:20:06 +0800
Subject: [PATCH 4/4] Update tr

---
 cheat/cheatsheets/tr | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cheat/cheatsheets/tr b/cheat/cheatsheets/tr
index 50f617f..09849e4 100644
--- a/cheat/cheatsheets/tr
+++ b/cheat/cheatsheets/tr
@@ -4,6 +4,7 @@ echo $PATH|tr -t ":" \n
 
 #remove all occurance of "ab"
 echo aabbcc |tr -d "ab"
+#ouput: cc
 
 #complement "aa"
 echo aabbccd |tr -c "aa" 1