Always be careful with shell expansion and variable names.

始终要谨慎使用Shell扩展和变量名称。

youdao

It's a good idea to get into the habit of using single quotes to surround your sed commands, so that shell expansion is disabled.

养成使用单引号来括起sed命令的习惯是个好注意，这样可以禁用shell扩展。

youdao

A command between back ticks runs as the shell interprets the command line, and the output of the command is used in the final expansion.

在Shell对命令行进行解释时，将执行反勾号之间的命令，并在最终的扩展结果中使用该命令的输出。

youdao

The offsetting of refinery shutdowns in the Northeast by, for instance, the expansion of Motiva Enterprises a joint venture between Shell (RDS.A) and Saudi Refining of its Port Arthur, Texas refinery to 600, 000 barrels a day, may also help prevent supply-constraint driven gasoline prices spikes.

FORBES: Spiking Summer Gas Prices to Ding Home Sales, Consumer Confidence