Linux
file content Viewis aLinuxOperations , the following is an essentialLinuxview a summary of the commands under common file content.
1. Cat starts displaying the contents of the file from the first line
Usage:
Cat-a is equivalent to-vet 's integration options, which can list some special characters rather than blanks;
Cat-b List line number, only for non-blank lines to do line number display, blank line is not marked line number;
Cat-e The end of the break-break byte $ display;
Cat-n printed travel numbers, along with blank lines, will have line numbers, unlike the-B option;
Cat-t the [tab] button to display ^i;
Cat-v lists some special characters that cannot be seen;
2. The TAC starts displaying the contents of the file from the last line
Tac-b Add a separator mark before the line and not at the end;
Tac-r The separation mark as a regular expression to parse;
Tac-s uses the specified string instead of line break as the separator flag;
3. NL display line number
Nl-b a travel number, whether or not it is a blank line;
Nl-b T blank line does not list line numbers;
Nl-n LN line number is displayed on the left of the screen ;
The Nl-n RN line number is displayed on the very right of its own field and does not add 0;
Nl-n RZ line number in its own field on the right of the display, and add 0;
Nl-w the number of digits occupied by the row number field;
4. more page-by-page display file contents
while the more program is running, you can press the following key:
Blank Key (space) : Represents a page down;
Enter: Represents a downward turn "line";
/ string: Represents the keyword in this display, down search for "string";
: F: Immediately display the file name and the number of lines currently displayed;
Q: The delegate immediately leaves more and no longer displays the contents of the file.
b or [Ctrl]-b: Represents a page back, but this action is only useful for files and useless for pipelines.
5. Less is similar to more, but better than more , he can page forward
The commands you can enter at run time are:
Blank key: Flip one Page down;
[PageDown] : Flip one page down;
[PageUp] : Flip one page up;
/ string: Search down the function of "string";
? string: Search up the function of "string";
N: Repeat the previous search ( with / or ?) about! ) ;
N: Reverse the repetition of the previous search ( and / or ?) about! ) ;
Q: Leave less this program;
6. Head shows the first few lines
Grammar:
Head-n followed by numbers, representing the number of rows displayed;
7. Tail show the following lines
Tail-n followed by numbers, representing the number of rows displayed;
Tail-f means continuous detection of the following file name, to wait until the [ctrl]-c will end tail detection;
the above is a more commonly used Linux file Content view command , this article only makes the simple grammar introduction, the concrete usage, but also needs to look for the study!
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