By

前言

本文主要介绍macOS环境下使用iterm2的rz(上传)和sz(下载)功能的安装流程，某些时候这些小命令可以方便的代替scp绕过安全限制执行简单的上传和下载任务，同理SecureCRT和Xshell也可以启用rz和sz功能。

更新历史

2021年11月18日 - 完善macOS lrzsz安装配置
2020年11月02日 - 初稿

阅读原文 - https://wsgzao.github.io/post/lrzsz/

lrzsz简介

lrzsz: free x/y/zmodem implementation

lrzsz is a unix communication package providing the XMODEM, YMODEM ZMODEM file transfer protocols. lrzsz is a heavily rehacked version of the last public domain release of Omen Technologies rzsz package, and is now free software and released under the GNU General Public Licence.

Features of lrzsz

  • very portable, automagically configured with GNU autoconf.
  • crash recovery.
  • up to 8KB block sizes (ZMODEM8K).
  • internationalized (using GNU gettext). German translation of the programs output exists.
  • far more secure than the original sources.
  • high performance. say `make vcheck-z’ and have a look at the BPS rate - i recently saw 1.4 MB per second transfering a large file through pipes (on a I586/133 system. Beat that!).
  • good blocksize calculation (tries to compute an optimal blocksize based on the number of errors occured).
  • It’s free software.

https://www.ohse.de/uwe/software/lrzsz.html

lrzsz原理

下载文件
在服务器上执行sz（Send by ZMODEM），先在终端上输出**B00000000000000，然后客户端在终端发送指令，表示拒绝，还是接收（接收的话，就在客户端运行rz指令与服务端交互）

上传文件
在服务器上执行rz（Receive by ZMODEM），先在终端上输出rz waiting to receive.**B0100000023be50，然后客户端发送指令，表示取消，还是上传（上传的话，在客户端运行sz命令与服务端交互）。

可以看到在上述流程中，对Terminal的要求就是，遇到特殊指令，触发对应的操作（执行本地命令）

由于macOS自带的Terminal.app不支持这个，所以网上大部分教程都是使用iTerm2

安装lrzsz

1
2
3
4
5
6
brew install lrzsz

==> Downloading https://homebrew.bintray.com/bottles/lrzsz-0.12.20_1.catalina.bottle.tar.gz
######################################################################## 100.0%
==> Pouring lrzsz-0.12.20_1.catalina.bottle.tar.gz
🍺  /usr/local/Cellar/lrzsz/0.12.20_1: 18 files, 473.9KB
  1. Install lrzsz on OSX: brew install lrzsz
  2. Save the iterm2-send-zmodem.sh and iterm2-recv-zmodem.sh scripts in /usr/local/bin/
  3. Set up Triggers in iTerm 2 like so:
    How to Create a Trigger
1
2
3
4
5
6
7
8
9
Regular expression: rz waiting to receive.\*\*B0100
Action: Run Silent Coprocess
Parameters: /usr/local/bin/iterm2-send-zmodem.sh
Instant: checked

Regular expression: \*\*B00000000000000
Action: Run Silent Coprocess
Parameters: /usr/local/bin/iterm2-recv-zmodem.sh
Instant: checked

To send a file to a remote machine:

  1. Type rz on the remote machine
  2. Select the file(s) on the local machine to send
  3. Wait for the coprocess indicator to disappear

The receive a file from a remote machine

  1. Type sz filename1 filename2 … filenameN on the remote machine
  2. Select the folder to receive to on the local machine
  3. Wait for the coprocess indicator to disappear

安装执行脚本

将iterm2-send-zmodem.sh和iterm2-recv-zmodem.sh保存到/usr/local/bin目录下。

iterm2-send-zmodem.sh

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
#!/bin/bash
# Author: Matt Mastracci (matthew@mastracci.com)
# AppleScript from http://stackoverflow.com/questions/4309087/cancel-button-on-osascript-in-a-bash-script
# licensed under cc-wiki with attribution required 
# Remainder of script public domain

osascript -e 'tell application "iTerm2" to version' > /dev/null 2>&1 && NAME=iTerm2 || NAME=iTerm
if [[ $NAME = "iTerm" ]]; then
	FILE=$(osascript -e 'tell application "iTerm" to activate' -e 'tell application "iTerm" to set thefile to choose file with prompt "Choose a file to send"' -e "do shell script (\"echo \"&(quoted form of POSIX path of thefile as Unicode text)&\"\")")
else
	FILE=$(osascript -e 'tell application "iTerm2" to activate' -e 'tell application "iTerm2" to set thefile to choose file with prompt "Choose a file to send"' -e "do shell script (\"echo \"&(quoted form of POSIX path of thefile as Unicode text)&\"\")")
fi
if [[ $FILE = "" ]]; then
	echo Cancelled.
	# Send ZModem cancel
	echo -e \\x18\\x18\\x18\\x18\\x18
	sleep 1
	echo
	echo \# Cancelled transfer
else
	/usr/local/bin/sz "$FILE" --escape --binary --bufsize 4096
	sleep 1
	echo
	echo \# Received "$FILE"
fi

iterm2-recv-zmodem.sh

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
#!/bin/bash
# Author: Matt Mastracci (matthew@mastracci.com)
# AppleScript from http://stackoverflow.com/questions/4309087/cancel-button-on-osascript-in-a-bash-script
# licensed under cc-wiki with attribution required 
# Remainder of script public domain

osascript -e 'tell application "iTerm2" to version' > /dev/null 2>&1 && NAME=iTerm2 || NAME=iTerm
if [[ $NAME = "iTerm" ]]; then
	FILE=$(osascript -e 'tell application "iTerm" to activate' -e 'tell application "iTerm" to set thefile to choose folder with prompt "Choose a folder to place received files in"' -e "do shell script (\"echo \"&(quoted form of POSIX path of thefile as Unicode text)&\"\")")
else
	FILE=$(osascript -e 'tell application "iTerm2" to activate' -e 'tell application "iTerm2" to set thefile to choose folder with prompt "Choose a folder to place received files in"' -e "do shell script (\"echo \"&(quoted form of POSIX path of thefile as Unicode text)&\"\")")
fi

if [[ $FILE = "" ]]; then
	echo Cancelled.
	# Send ZModem cancel
	echo -e \\x18\\x18\\x18\\x18\\x18
	sleep 1
	echo
	echo \# Cancelled transfer
else
	cd "$FILE"
	/usr/local/bin/rz --rename --escape --binary --bufsize 4096 
	sleep 1
	echo
	echo
	echo \# Sent \-\> $FILE
fi
1
2
3
4
5
6
7
8
# 在/usr/loal/bin 目录下创建两个文件
cd /usr/local/bin
wget https://raw.githubusercontent.com/RobberPhex/iterm2-zmodem/master/iterm2-recv-zmodem.sh
wget https://raw.githubusercontent.com/RobberPhex/iterm2-zmodem/master/iterm2-send-zmodem.sh

# 赋予这两个文件可执行权限
chmod 777 /usr/local/bin/iterm2-*

设置Iterm2的Tirgger特性

配置好配置文件之后，开始对iTerm2进行配置

点击 iTerm2 的设置界面 Perference-> Profiles -> Default -> Advanced -> Triggers 的 Edit 按钮，加入以下配置

添加两条trigger，分别设置 Regular expression，Action，Parameters，Instant如下：

1
2
3
4
5
6
7
8
9
Regular expression: rz waiting to receive.\*\*B0100
Action: Run Silent Coprocess
Parameters: /usr/local/bin/iterm2-send-zmodem.sh
Instant: checked

Regular expression: \*\*B00000000000000
Action: Run Silent Coprocess
Parameters: /usr/local/bin/iterm2-recv-zmodem.sh
Instant: checked

使用rz和sz

前提是客户端也要安装lrzsz

  • rz 上传功能
    • 在bash中，也就是iTerm2终端输入rz 就会弹出文件选择框，选择文件 choose 就开始上传，会上传到当前目录
    • rz中的r意为received（接收），告诉客户端，我（服务器）要接收文件 received by cilent，就等同于客户端在上传。
  • sz 下载功能
    • sz fileName(你要下载的文件的名字) 回车，会弹出窗体 我们选择要保存的地方即可。
    • sz中的s意为send（发送），告诉客户端，我（服务器）要发送文件 send to cilent，就等同于客户端在下载。
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
sz用法：

	下载一个文件
	sz filename 

	下载多个文件
	sz filename1 filename2

	下载dir目录下的所有文件，不包含dir下的文件夹
	sz dir/*

rz用法：

	输入rz回车后，会出现文件选择对话框，选择需要上传文件，一次可以指定多个文件，上传到服务器的路径为当前执行rz命令的目录。


-b 以二进制方式，默认为文本方式。（Binary （tell it like it is） file transfer override.）

-e 对所有控制字符转义。（Force sender to escape all control characters; normally XON， XOFF， DLE， CR-@-CR， and Ctrl-X are escaped.）

果要保证上传的文件内容在服务器端保存之后与原始文件一致，最好同时设置这两个标志，如下所示方式使用：

rz -be

备注说明

  1. rz与sz只适合小的文件传输，大文件还是使用Filezilla与xftp等工具进行传输；
  2. 只能传输文件，而不能传输文件夹；
  3. 不是所有工具都支持rz与sz，必须支持ZModem协议才行，例如putty不能使用rz与sz。

参考文章

macOS下使用ZMODEM协议上传/下载文件

ZModem integration for iTerm 2

通过SecureCRT的rz、sz和sftp实现文件的上传和下载

文章目录
  1. 1. 前言
  2. 2. 更新历史
  3. 3. lrzsz简介
  4. 4. lrzsz原理
  5. 5. 安装lrzsz
  6. 6. 安装执行脚本
  7. 7. 设置Iterm2的Tirgger特性
  8. 8. 使用rz和sz
  9. 9. 参考文章