- 1. linux
- bc command is used for command line calculator. It is similar
to basic calculator. By using which we can do basic mathematical
calculations. SYNTAX:
- bc COMMAND:
2. The Syntax is 3. bc [options] 4. cal COMMAND: 5. cal command is
used to display the calendar. 6. SYNTAX: 7. The Syntax is 8. cal
[options] [month] [year]
9.
- cat COMMAND: 10. cat linux command concatenates files and print
it on the standard output. 11. SYNTAX: 12. The Syntax is 13. cat
[OPTIONS] [FILE]... 14. cd COMMAND: 15. cd command is used to
change the directory. 16. SYNTAX: 17. The Syntax is 18. cd
[directory | ~ | ./ | ../ | - ] 19. cp COMMAND: 20. cp command copy
files from one location to another. If the destination is an
existing file, then the file is overwritten; if the destination is
an existing directory, the file is copied into the directory (the
directory is not overwritten). 21. SYNTAX: 22. The Syntax is 23. cp
[OPTIONS]... SOURCE DEST
24.
date command prints the date and time. SYNTAX: The Syntax is
date[options] [+format] [date]
- echo COMMAND: 25. echo command prints the given input string to
standard output. 26. SYNTAX: 27. The Syntax is 28. echo [options..]
[string] 29. grep COMMAND: 30. grep command selects and prints the
lines from a file which matches a given string or pattern. 31.
SYNTAX: 32. The Syntax is
33.
id command prints the effective(current) and real userid(UID)s
and groupid(GID)s. SYNTAX: The Syntax is id [options]
- last COMMAND: 34. last command is used to display the last
logged in users list. Last logged in users informations are read
from the file /var/log/wtmp. 35. SYNTAX: 36. The Syntax is 37. last
[options] 38. lastlog COMMAND: 39. lastlog command is used to print
the last login times for system accounts. Login information is read
from the file /var/log/lastlog. 40. SYNTAX: 41. The Syntax is 42.
lastlog [options]
43.
ls command lists the files and directories under current working
directory. SYNTAX: The Syntax is ls [OPTIONS]... [FILE]
man command which is short for manual, provides in depth
information about the requested command (or) allows users to search
for commands related to a particular keyword. SYNTAX: The Syntax is
man commandname [options]
mkdir command is used to create one or more directories. SYNTAX:
The Syntax is mkdir [options] directories 44.
mv command which is short for move. It is used to move/rename
file from one directory to another. mv command is different from cp
command as it completely removes the file from the source and moves
to the directory specified, where cp command just copies the
content from one file to another. SYNTAX: The Syntax is mv [-f]
[-i] oldname newname
pwd - Print Working Directory. pwd command prints the full
filename of the current working directory. SYNTAX: The Syntax is
pwd [options]
- rm COMMAND: 45. rm linux command is used to remove/delete the
file from the directory. 46. SYNTAX: 47. The Syntax is
48.
rmdir command is used to delete/remove a directory and its
subdirectories. SYNTAX: The Syntax is rmdir [options..]
Directory
- sort COMMAND: 49. sort command is used to sort the lines in a
text file. 50. SYNTAX: 51. The Syntax is 52. sort [options]
filename 53. Shutdown COMMAND: 54. Shutdown - Turn off the computer
immediately or at a specified time. 55. SYNTAX: 56. The Syntax is
57. /sbin/shutdown [-t sec] [-arkhncfFHP] time
[warning-message]
58.
who command can list the names of users currently logged in,
their terminal, the time they have been logged in, and the name of
the host from which they have logged in. SYNTAX: The Syntax is who
[options] [file]
whois command lists the information about the domain owner of
the given domain. SYNTAX: The Syntax is whois [option] query
Options mk 59.
- more -Allows file contents or piped output to be sent to the
screen one page at a time 60. less -Opposite of the more command
61. clear -Clears the terminal screen. 62. cmp file1 file2-Compares
two files, reporting all discrepancies. Similar to the diff
command, though the output format differs. 63. wcfilename--- tells
you how many lines, words, and characters there are in a file 64.
whoami--- returns your username. Sounds useless, but isn't. You may
need to find out who it is who forgot to log out somewhere, and
make sure *you* have logged out.
65.
The..says to move up to the parent directory, in this
case/users/jones , and then down to the sub-directory,samples . You
can also usecd ..to back up from subdirectories level by level.
To view the first ten lines in a file, use
theheadcommand.Syntax:head[ -count ]filename
To view the last ten lines in a file, use
thetailcommand.Syntax:tail[-count] filename
