what is difference between sed and awk in unix?
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The difference between sed and awk is that sed is a command utility that works with streams of characters for searching, filtering and text processing while awk more powerful and robust than sed with sophisticated programming constructs such as if/else, while, do/while etc.
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cat is for listing contents of any file. echo is for listing value of some variable. Besides, echo without any value is used to insert a new line in many shell scripts. For more subtle and complete difference you can always google.
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The ^M is a carriage-return character. If you see this, you're probably looking at a file that originated in the DOS/Windows world, where an end-of-line is marked by a carriage return/newline pair, whereas in the Unix world, end-of-line is marked by a single newline.
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the difference being that “bash” is the default shell with Linux, so “"Linux scripting” really means “bash scripting” … while the other Unixes/Unices each have their own default shell, which will be older than the bash shell used by Linux.
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NF is a predefined variable whose value is the number of fields in the current record. awk automatically updates the value of NF each time it reads a record. No matter how many fields there are, the last field in a record can be represented by $NF . So, $NF is the same as $7 , which is ' example.
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['diff Command. I like to start with the original Unix command-line tool that shows you the difference between two computer files. ... ', 'Vimdiff Command. ... ', 'Kompare. ... ', 'DiffMerge. ... ', 'Meld – Diff Tool. ... ', 'Diffuse – GUI Diff Tool. ... ', 'XXdiff – Diff and Merge Tool. ... ', 'KDiff3 – – Diff and Merge Tool.']
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is that delta is (computing) the set of differences between two versions of a file while plain is (computing) containing no extended or nonprinting characters (especially in plain text).
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All Unix shells are similar, but they have different features. ... sh is the original Bourne shell. On many non-Linux systems, this is an old shell without the POSIX features. Thus bash and ksh (or even csh and tcsh) are better choices than sh.
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Bash (bash) is one of many available (yet the most commonly used) Unix shells. ... Shell scripting is scripting in any shell, whereas Bash scripting is scripting specifically for Bash. In practice, however, "shell script" and "bash script" are often used interchangeably, unless the shell in question is not Bash.
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Zsh's syntax is not completely compatible with bash, but it's close. A lot of code will keep working, for example typical aliases and functions. The main differences are in interactive configuration features.
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The main difference between map() and grep() is: map() you need to loop over each element in an array and modify its value whilst the $. Grep() method returns the filtered array using some filter condition from an existing array. ... Grep() helps you to get a filter array.
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['Use a basic regular expression (just grep ) and escape the | character in the regular expression. ... ', 'Use an extended regular expression with egrep or grep -E , as Julian already pointed out in his answer. ... ', 'If it is two different patterns that you want to match, you could also specify them separately in -e options:']
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The main difference between the two is that grep is used to search for a particular string in a file whereas find is used to locate files in a directory, etc. ... Find is for searching files and grep is for searching string.
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The difference is in how you access them. Arguments are accessible through argv . Standard input is accessible through the stdin file descriptor.
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"\ is used as an escape sequence in many programming languages, including Java. \n: Is used to go to next line. We can use this to break a line or print a newline. \t : Is used to add tab.
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KSH (The Korn Shell) was developed many years before the BASH. Ksh has associative arrays and handles loop syntax better than bash. ... Bash can handle exit codes from pipes in a cleaner way. Bash and KSH are both Bourne=compatible shell, they share common function and features and can be interchangeable to use.
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\Z is same as $ , it matches the end of the string, the end of the string can be followed by a line break. \z matches the end of the string, can't be followed by line break.