[Linux] bc | determine whether the command is successfully executed bc: www.2cto. comno1321456echo & quot; obase2; $ no & quot; | bc binary, octal, and hexadecimal notation. the quotation marks can be replaced to determine whether the command is successfully executed: run echo $? Such...
[Linux] bc | determine whether the command is successfully executed bc: www.2cto.com no = 1321456 echo "obase = 2; $ no" | bc binary, octal, same as hexadecimal, the quotation mark content can be replaced to realize the +-* % operation to determine whether the command is successfully executed: after the command is executed, run echo $? If the result is not 0, the operation is unsuccessful. Otherwise, the operation is successful. 0 standard input 1 standard output 2 standard errors example: output lscommand error information to out.txt ls "cuowucanshu" 2> out.txt> clear File> append file content
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