From 794d4ba7b35f0dd0787ab899688857d54d29b801 Mon Sep 17 00:00:00 2001
From: PoplarYang <echohelloyang@gmail.com>
Date: Mon, 16 May 2022 00:13:47 +0800
Subject: [PATCH 1/3] fix typo "//dev/shm"

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 4ab8425..9574b34 100644
--- a/README.md
+++ b/README.md
@@ -3240,9 +3240,9 @@ fallocate -l 10G 10Gigfile
 
 ##### Create dummy file of certain size (e.g. 200mb)
 ```bash
-dd if=/dev/zero of=//dev/shm/200m bs=1024k count=200
+dd if=/dev/zero of=/dev/shm/200m bs=1024k count=200
 # or
-dd if=/dev/zero of=//dev/shm/200m bs=1M count=200
+dd if=/dev/zero of=/dev/shm/200m bs=1M count=200
 
 # Standard output:
 # 200+0 records in

From 3cf8bdfe461789172a09a7bdb68a8c539e0ad76f Mon Sep 17 00:00:00 2001
From: PoplarYang <echohelloyang@gmail.com>
Date: Mon, 16 May 2022 00:33:16 +0800
Subject: [PATCH 2/3] add 'current time point for N days ago or after'

---
 README.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/README.md b/README.md
index 9574b34..bc14aa9 100644
--- a/README.md
+++ b/README.md
@@ -1145,6 +1145,21 @@ date --date @1615852800
 
 ```
 
+##### Print current time point for N days ago or after N days
+```bash
+# get this time a day ago
+date -d"1 day ago" +"%F %H:%M:%S"
+
+# get this time tomorrow
+date -d"-1 day ago" +"%F %H:%M:%S"
+
+# get this time 7 days ago
+date -d"1 week ago" +"%F %H:%M:%S"
+
+# get this time a week ago
+date -d"7 day ago" +"%F %H:%M:%S"
+```
+
 ##### wait for random duration (e.g. sleep 1-5 second, like adding a jitter)
 ```bash
 sleep $[ ( $RANDOM % 5 ) + 1 ]

From 232900349a659583902ac26f4007a6b6535642fb Mon Sep 17 00:00:00 2001
From: PoplarYang <echohelloyang@gmail.com>
Date: Tue, 17 May 2022 18:07:22 +0800
Subject: [PATCH 3/3] fix typo

Co-authored-by: kang <1115610574@qq.com>
---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index bc14aa9..2246c55 100644
--- a/README.md
+++ b/README.md
@@ -1154,10 +1154,10 @@ date -d"1 day ago" +"%F %H:%M:%S"
 date -d"-1 day ago" +"%F %H:%M:%S"
 
 # get this time 7 days ago
-date -d"1 week ago" +"%F %H:%M:%S"
+date -d"7 days ago" +"%F %H:%M:%S"
 
 # get this time a week ago
-date -d"7 day ago" +"%F %H:%M:%S"
+date -d"1 week ago" +"%F %H:%M:%S"
 ```
 
 ##### wait for random duration (e.g. sleep 1-5 second, like adding a jitter)