Difference between revisions of "Centos File System Commands"
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[!a-e] Matches 1 character in a filename—provided this character is NOT an a, b, c, d, or e | [!a-e] Matches 1 character in a filename—provided this character is NOT an a, b, c, d, or e | ||
</pre> | </pre> | ||
'''Viewing Text Files''' | |||
cat -n file.txt | |||
# will display the file with line numbers | |||
tac file.text | |||
#will display the file in reverse | |||
'''The head command displays the first 10 lines (including blank lines) of a text file to the terminal screen but can also take a numeric option specifying a dif- ferent number of lines to display. ''' | |||
head -3 | |||
'''tail command can be used to display the end of text files. By default, the tail command displays the final 10 lines of a file, but it can also take a numeric option specifying the number of lines to dis- play on the terminal screen''' | |||
tail -3 | |||
Revision as of 20:42, 27 January 2019
File Command displays type of file
file me.text #output ASCII text
Wildcard Metacharacters
* Matches 0 or more characters in a filename ? Matches 1 character in a filename [aegh] Matches 1 character in a filename—provided this character is either an a, e, g, or h [a-e] Matches 1 character in a filename—provided this character is either an a, b, c, d, or e [!a-e] Matches 1 character in a filename—provided this character is NOT an a, b, c, d, or e
Viewing Text Files
cat -n file.txt # will display the file with line numbers tac file.text #will display the file in reverse
The head command displays the first 10 lines (including blank lines) of a text file to the terminal screen but can also take a numeric option specifying a dif- ferent number of lines to display.
head -3
tail command can be used to display the end of text files. By default, the tail command displays the final 10 lines of a file, but it can also take a numeric option specifying the number of lines to dis- play on the terminal screen
tail -3