reference: http://www.denx.de/wiki/DULG/UBootCmdGroupExec => help source source - run script from memory Usage: source [addr] - run script starting at addr - A valid image header must be present => With the source command you can run "shell&quo…

uboot commad test test - minimal test like /bin/sh so we can use test command to some judge for example, test –n $uenvcmd    test var uenvcmd length !eq  zero detail learning you  can reference url: https://www.cnblogs.com/tankblog/p/6160808.html Not…

=> fstypefstype - Look up a filesystem type Usage:fstype <interface> <dev>:<part>- print filesystem typefstype <interface> <dev>:<part> <varname>- set environment variable to filesystem type example: => fsty…

=> part --helppart - disk partition related commands Usage:part uuid <interface> <dev>:<part> - print partition UUIDpart uuid <interface> <dev>:<part> <varname> - set environment variable to partition UUIDpart…

结论: The source command is only available in bash, and the supervisor command is run by sh. I would recommend using a script to perform your commands   代码示例: [program:alarm_handler] command = bash /opt/disk2/var/www/maliksi/file_protect/management/com…

在Ubuntu系统中执行脚本的时候突然出现错误"source command not found in sh shell" 这个其实在Ubuntu 当中 执行脚本默认的使用的是dash,而非bash 通过命令 #ls -l `which sh` # /bin/sh -> dash 我们发现, 脚本中默认使用的sh其实对应的是dash, 而不是bash. 为了解决这个错误我们就需要把这个对应关系修改下, 让sh对应到bash 执行以下命令, 在弹出的框里面选择No即可把sh对应的链…

Ubuntu Server上执行以下命令,可以看到默认打开的文件数限制为1024个. $ ulimit -n 1024 编辑/etc/profile配置文件,在最后添加一行: ulimit -SHn 65535 要让配置生效: $ sudo source /etc/profile sudo: source: command not found 我们直接执行ulimit -SHn 65535命令又会怎么样呢? $ ulimit -SHn 65535 -bash: ulimit: open file…

我使用的U-Boot版本是u-boot-2012.10,编译的步骤为 cd u-boot-2012.10 make s5p_goni_config sudo make 然后,就会看到错误提示 /bin/bash: arm-linux-gcc: command not found dirname: missing operand Try 'dirname --help' for more information. 在arm-linux-gcc确认安装无误的前提下(可以参照 https://www.…

$ sudo -s # source /etc/profile…

pseudocode: If(reset_button was pressed ) { Change  uboot env bootslot^1 }…