The following is a Linux Dictionary word of the day:
dd – command for data duplicator which converts
and copies a file, writes disk headers and boot based records.
Note:
running this command with the incorrect parameters and data can delete data.
if
parameter for read from file.
of
parameter to write from file.
Example
copy data from sbin/mdev to sbin/mdev2:
dd if=/sbin/mdev of=/sbin/mdev2
The following is a Linux Dictionary word of the day:
dc – command that runs a desk calculator.
+ = option for addition.
- = option for subtraction.
* = option for multiplication.
/ = option for division.
% = option to display reminder of division operation.
c = option to clear the stack.
f = option to display entire contents of the stack.
p = option which prints to the screen the first item in the stack.
Example:
dc
10
f
10
10+p
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date – displays or changes the date & time.
-s = parameter for set.
Example: date
Example: Displays the date in the format of mm/dd/yy then the time in the format of hours:minutes:seconds:
date "+DATE: %m/%d/%y%nTIME: %H:%M:%S"
" – starts display line.
+DATE: option to concatenate the word DATE: on the output line.
%m option to display month.
%d option to display date.
%y option to display year.
%n option for a new line.
displays the date in the format as mm/dd/yy.
TIME: option to concatenate word TIME: on the output line.
%H: option for hour.
%M option for minutes.
%S option for seconds
" end of display line.
cut – used for removing/parsing text in specific files or strings.
-d parameter which stands for delimiter.
-f parameter for file which then needs a number of how many lines to cut.
Example: using a , as a delimiter to cut the number of fields specified.
cut -d “,” -f 2 hello.c
ctags – command creates tags in files which then can be utilized for referencing.
-a parameter for appending.
-F parameter for searching for a pattern.
-R parameter to resurse through all files.
Example: ctags -R *
csplit – command utilized to split a file into several parts based on context lines provided.
Example: csplit hello.txt 5
crontab – table used with the cron command to edit, read and remove the files
read by the cron daemon. Each '*' asterisk stands for a portion of either
the time or date with the corresponding column in each row.
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The following is a Linux Dictionary word of the day:
cron – service to execute scheduled commands or
scripts every
minute, hour, day of the month, month of the year, day of the week. Each '*'
asterisk stands for a portion of either the time or date with the corresponding
column in each row. Cron needs to be utilized with a crontab file.
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cpio – copies files to and from an archive.
-o parameter which creates the archive.
-v parameter prints the names of the files as they are added to the archive.
Example: ls | cpio -ov > archive_of_files.cpiocontinue – resume the next iteration of a loop
in the current iteration of a for, while, or until loop.
Example:
if(( $a==5 ))
then
continue
fi
-f parameter to force operation.
Example: compress hello.txt
command line – aspect provided directly on the screen where one types specific commands.
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The following is a Linux Dictionary word of the day:
comm – compares two sorted files line by line showing unique lines and then the common lines.
Example: comm hello.txt hello2.txt
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The following is a Linux Dictionary word of the day:
cmp – compares two files and only reports if the files are different.
Example: cmp hello.txt hello2.txt
clear – clears all the text on the display screen.
Example: clear
The following is a Linux Dictionary word of the day:
cksum – prints the cyclic redundancy check (CRC) checksum and byte counts.
Example: cksum hello.txt
The following is a Linux Dictionary word of the day:
chsh – command utilized to change the user's login shell.
-s parameter to set the shell listed as the current shell
-u parameter to list all shells available.
Example: chsh -s /bin/bash
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-p parameter to re-encrypt the existing secret key with a user's login password.
Example: chkey -p
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The following is a Linux dictionary word of the day:
chkconfig – command that handles and shows the
runlevel of the services at each of the stages being run within Linux.
Example:
chkconfig
