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![wildcards wildcards are interpreted by the shell and the results are returned to the command you run. There are three main wildcards in Linux: An asterisk (*) – matches one or more occurrences of any character, including no character. Question mark (?) – represents or matches a single occurrence of any character. Bracketed characters ([ ]) – matches any occurrence of character enclosed in the square brackets. It is possible to use different types of characters (alphanumeric characters): numbers, letters, other special characters etc.](https://image.slidesharecdn.com/day2-unix-250401082712-ded1e7ed/75/linux-commands-such-as-ls-cd-grep-and-other-useful-commands-9-2048.jpg)
![ls -x chap[123], ls -x chap[1-4]](https://image.slidesharecdn.com/day2-unix-250401082712-ded1e7ed/75/linux-commands-such-as-ls-cd-grep-and-other-useful-commands-11-2048.jpg)
![df -H Df: This manual page documents the GNU version of df. df displays the amount of disk space available on the file system containing each file name argument. Syntax: df [OPTION] [FILE]](https://image.slidesharecdn.com/day2-unix-250401082712-ded1e7ed/75/linux-commands-such-as-ls-cd-grep-and-other-useful-commands-20-2048.jpg)
![man grep, inode grep: grep searches for PATTERNS in each FILE. PATTERNS is one or more patterns separated by newline characters, and grep prints each line that matches a pattern. Typically PATTERNS should be quoted when grep is used in a shell command Syntax: grep [OPTION...] PATTERNS [FILE...] grep [OPTION...] -e PATTERNS ... [FILE...] grep [OPTION...] -f PATTERN_FILE ... [FILE...] inode: Each file has an inode containing metadata about the file. An application can retrieve this metadata using stat(2) (or related calls), which returns a stat structure, or statx(2), which returns a statx structure.](https://image.slidesharecdn.com/day2-unix-250401082712-ded1e7ed/75/linux-commands-such-as-ls-cd-grep-and-other-useful-commands-23-2048.jpg)
![ps , ps -eman ps : ps displays information about a selection of the active processes. Syntax: ps [options] Output:](https://image.slidesharecdn.com/day2-unix-250401082712-ded1e7ed/75/linux-commands-such-as-ls-cd-grep-and-other-useful-commands-36-2048.jpg)
linux commands such as ls cd grep and other useful commands
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- 2. history > history1.txt Output:store all the previous command in .txt
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- 4. cat file1 file2 catfile1 file2 > file3
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- 6. ls -l (user,group and others) Output:
- 7. ls -lh display filesize in easy to read format. i.e i.e M for MB, K for KB, G for GB
- 8. ls -lt sort thefile names displayed in the order of last modification time.You will be finding it handy to use it in combination with -l option.
- 9. wildcards wildcards are interpretedby the shell and the results are returned to the command you run. There are three main wildcards in Linux: An asterisk (*) – matches one or more occurrences of any character, including no character. Question mark (?) – represents or matches a single occurrence of any character. Bracketed characters ([ ]) – matches any occurrence of character enclosed in the square brackets. It is possible to use different types of characters (alphanumeric characters): numbers, letters, other special characters etc.
- 10. ls -x chap*,ls -x chap??, ls -x chap? Output:
- 11. ls -x chap[123],ls -x chap[1-4]
- 12. wc history, ls| wc Output:
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- 16. echo 'The avgpay is $100'
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- 20. df -H Df: Thismanual page documents the GNU version of df. df displays the amount of disk space available on the file system containing each file name argument. Syntax: df [OPTION] [FILE]
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- 22. du -hs folder,tty, uname -r Output:
- 23. man grep, inode grep:grep searches for PATTERNS in each FILE. PATTERNS is one or more patterns separated by newline characters, and grep prints each line that matches a pattern. Typically PATTERNS should be quoted when grep is used in a shell command Syntax: grep [OPTION...] PATTERNS [FILE...] grep [OPTION...] -e PATTERNS ... [FILE...] grep [OPTION...] -f PATTERN_FILE ... [FILE...] inode: Each file has an inode containing metadata about the file. An application can retrieve this metadata using stat(2) (or related calls), which returns a stat structure, or statx(2), which returns a statx structure.
- 24. grep -c "unix"grepfile
- 25.
- 26. grep -o "unix"grepfile
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- 28.
- 29. grep -i "UNix"grepfile
- 30. grep -c "unix"grepfile
- 31.
- 32. grep -w "unix"grepfile, grep -o "unix" grepfile Output:
- 33. grep -n "unix"grepfile, grep -v "unix" grepfile Output:
- 34. grep "^unix" grepfile, grep"os.$" grepfile Output:
- 35.
- 36. ps , ps-eman ps : ps displays information about a selection of the active processes. Syntax: ps [options] Output:
- 37.
- 38. man kill, kill-9 process_id
- 39.