Welcome to the Slackware Documentation Project

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
howtos:general_admin:cli_constructs_and_useful_info [2012/10/21 10:50 (UTC)]
htexmexh [Sources]
howtos:general_admin:cli_constructs_and_useful_info [2013/04/02 15:19 (UTC)] (current)
htexmexh [Constructs]
Line 9: Line 9:
 ls -1 /​var/​log/​packages | rev | cut -d - -f 1-3 --complement | rev ls -1 /​var/​log/​packages | rev | cut -d - -f 1-3 --complement | rev
 </​code>​ </​code>​
-Or if you wanted to get the full patch of a file, minus the suffix.+Or if you wanted to get the full path of a file, minus the suffix.
 <code bash> <code bash>
 echo /​proc/​config.gz | rev | cut -d. -f1 --complement | rev echo /​proc/​config.gz | rev | cut -d. -f1 --complement | rev
Line 97: Line 97:
 bash-4.2$ ​ bash-4.2$ ​
 </​code>​ </​code>​
-Clearly you need to quote a file with spaces. You could use single quotes here, because no variable ​were inside the quotes. You should not quote in this case:+Clearly you need to quote a file with spaces. You could use single quotes here, because no variables ​were inside the quotes. You should not quote in this case:
 <code bash> <code bash>
 bash-4.2$ for i in $(seq 1 10); do printf "$i "; done; echo;  ​ bash-4.2$ for i in $(seq 1 10); do printf "$i "; done; echo;  ​
Line 148: Line 148:
 === External Links === === External Links ===
   * http://​www.grymoire.com/​Unix/​Quote.html   * http://​www.grymoire.com/​Unix/​Quote.html
-==== Regex ====+==== Regular expressions ​====
 === Basic === === Basic ===
   * ''​.''​ matches any single character.   * ''​.''​ matches any single character.
Line 174: Line 174:
     * Example: ''​\<​[tT]he\>''​ matches the word ''​the''​ or ''​The''​.     * Example: ''​\<​[tT]he\>''​ matches the word ''​the''​ or ''​The''​.
   * ''​*''​ matches any number of the previous character or nothing = no character. Example: ''​[0-9]*''​ which will match any number of numbers. ''​.*''​ matches any number of anything.   * ''​*''​ matches any number of the previous character or nothing = no character. Example: ''​[0-9]*''​ which will match any number of numbers. ''​.*''​ matches any number of anything.
-=== Extended ===+=== Extended ​regular expressions ​===
 The following must be supported by the program for them to work. For example for grep you must run ''​egrep''​ or ''​grep -E''​. The following must be supported by the program for them to work. For example for grep you must run ''​egrep''​ or ''​grep -E''​.
   * ''​+''​ matches any number of the previous character, like ''​*'',​ but there must be at least one to match, so it will not match nothing or no character.   * ''​+''​ matches any number of the previous character, like ''​*'',​ but there must be at least one to match, so it will not match nothing or no character.
Line 204: Line 204:
 </​code>​ </​code>​
 === cmp === === cmp ===
-This can compare two files byte by byte, and can be more useful ​that checksums. For example, after you burn a CD/DVD, you can run:+This can compare two files byte by byte, and can be more useful ​than checksums. For example, after you burn a CD/DVD, you can run:
 <code bash> <code bash>
 cmp slackware.iso /dev/sr0 cmp slackware.iso /dev/sr0

In Other Languages
QR Code
QR Code howtos:general_admin:cli_constructs_and_useful_info (generated for current page)