Linux Learning tutorial-some exceptions to commands under Linux

Incomplete command: when the command is not finished (quotation marks or parentheses are not matched), the enter key is pressed accidentally, and the terminal will prompt a > indicating that the command is incomplete, which can continue to be entered, or ctrl+c can terminate the input and start all over again. (there is another problem of incomplete commands when using the following sed command.) some anomalies of commands under Linux

Incomplete command: when the command is not finished (quotation marks or parentheses are not matched), the enter key is pressed accidentally, and the terminal will prompt a > indicating that the command is incomplete, which can continue to be entered, or ctrl+c can terminate the input and start all over again.

When using the following sed command, there is another problem with incomplete commands: ct@ehbio:~/ehbio_project$ rename 'ehbio2 >' ct@ehbio:~/ehbio_project$ rename 'ehbio2 > ^ Cct@ehbio:~/ehbio_project$

File name input error: one more letter, one less letter, case problem ct@ehbio:~/ehbio_project$lsehbio2.fa ehbio3.fa ehbio4.fa ehbio.fa second.fa# renaming did not take effect ct@ehbio:~/ehbio_project$ rename 'ehbio2'' ehbio5' ebio2.fact@ehbio:~/ehbio_project$ lsehbio2.fa ehbio3.fa ehbio4.fa ehbio.fa second.fa# look carefully that ehbio2.fa is written into ebio2.fa, correct it. Z8vb3e9jtel4m99ss6e7eZVB3e9jtel4m99ss6e7eZVb3e9jtel4m99ss6e7eZVb3e9jtel4m99ss6e7eZVb3e9jtel4m99ss6e7eZVb3e9jtel4m99ss6e7eZVb3e9jtel4m99ss6e7eZVb3e9jtel4m99ss6e7eZVb3e9jtel4m99ss6e7eZVB3e9jtel4m99ss6e7eZVB3e9jtel4m99ss6e7eZVB3e9jtel4m99ss6e7eZVB3e9j Without providing an absolute path. Or soft connection failure ct@ehbio:~/ehbio_project$ lsehbio3.fa ehbio4.fa ehbio5.fa ehbio6.fa ehbio.fa second.fact@ehbio:~/ehbio_project$ ls.. / dataehbio2.fa first.fa# there is no ehbio2.fact@ehbio:~/ehbio_project$ less ehbio2.faehbio2.fa in the current directory: there is no file or directory # ehbio2.fa is in the data directory of the previous directory ct@ehbio:~/ehbio_project$ ls.. / data/ehbio2. Fa.. / data/ehbio2.fa# plus path still cannot access ct@ehbio:~/ehbio_project$ less.. / data/ehbio2.fa.. / data/ehbio2.fa: there is no file or directory # the problem above is soft connection failure The original ehbio2.fa was deleted in the previous operation, so the shortcut fails # correct access to ct@ehbio:~/ehbio_project$ tail-n 3.. / data/first.fa ACGGAGCGAGCTAGTGCAGCGAGGAGCTGAGTCGAGCCAGGACAGGAGCTAend

Original address: https://www.linuxprobe.com/linux-learning-command.html