Awk Script Syntax Error
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Awk Syntax Error In Regular Expression
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Awk Gsub Syntax Error
other. Join them; it only takes a minute: Sign up AWK syntax error - what's causing it? up vote 3 down vote favorite I have simple bash script: #!/bin/sh column=${1:-1} awk ' {colawk='$column'+2; print $colawk}' awk '(x=4; print $x)' awk there is a regular expression error But I have received error: awk: (x=4; print $x) awk: ^ syntax error awk: cmd. line:1: (x=4; print $x) awk: cmd. line:1: ^ unexpected newline or end of string Why? Code in the previous line works. bash awk share|improve this question edited Dec 13 '11 at 7:49 paxdiablo 488k1179691416 asked Dec 12 '11 at 12:24 user710818 6,4153197163 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote accepted Your problem is with using parentheses awk fatal invalid regular expression instead of braces. Try: awk '{x=4; print $x}' instead, as in the following transcript: pax$ echo a b c d e | awk '(x=4; print $x)' awk: cmd. line:1: (x=4; print $x) awk: cmd. line:1: ^ syntax error awk: cmd. line:2: (x=4; print $x) awk: cmd. line:2: ^ unexpected newline or end of string pax$ echo a b c d e | awk '{x=4; print $x}' d share|improve this answer edited Dec 12 '11 at 12:34 answered Dec 12 '11 at 12:27 paxdiablo 488k1179691416 add a comment| up vote 4 down vote An AWK program is a series of pattern action pairs, written as: condition { action } where condition is typically an expression and action is a series of commands. print is not expression but a statement, so it's a syntax error as expected. share|improve this answer answered Dec 12 '11 at 14:42 kev 70.2k21140185 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged bash awk or ask your own question. asked 4 years ago viewed 11163 times active 3 years ago Related
/21/ { print $0 }' mail-list inventory-shipped However, gawk ignores newlines after any of the following symbols and keywords: , { ? :
Awk Syntax Error Near Unexpected Token ('
|| && do else A newline at any other point is considered awk syntax error near line 1 the end of the statement.9 If you would like to split a single statement into two lines at
Awk Syntax Error At Source Line 1
a point where a newline would terminate it, you can continue it by ending the first line with a backslash character (‘\’). The backslash must be the final character on http://stackoverflow.com/questions/8474276/awk-syntax-error-whats-causing-it the line in order to be recognized as a continuation character. A backslash is allowed anywhere in the statement, even in the middle of a string or regular expression. For example: awk '/This regular expression is too long, so continue it\ on the next line/ { print $1 }' We have generally not used backslash continuation in our sample programs. gawk https://www.gnu.org/s/gawk/manual/html_node/Statements_002fLines.html places no limit on the length of a line, so backslash continuation is never strictly necessary; it just makes programs more readable. For this same reason, as well as for clarity, we have kept most statements short in the programs presented throughout the Web page. Backslash continuation is most useful when your awk program is in a separate source file instead of entered from the command line. You should also note that many awk implementations are more particular about where you may use backslash continuation. For example, they may not allow you to split a string constant using backslash continuation. Thus, for maximum portability of your awk programs, it is best not to split your lines in the middle of a regular expression or a string. CAUTION: Backslash continuation does not work as described with the C shell. It works for awk programs in files and for one-shot programs, provided you are using a POSIX-compliant shell, such as the Unix Bourne shell or Bash. But the C shell behaves differently! There you must use two backslashes in a row, fol
about awk, see An Awk Primer. Contents 1 Versions 2 Introduction 3 Some basics 4 Some examples 5 Regular expressions 6 Booleans 7 Start and End https://en.wikibooks.org/wiki/AWK 8 Begin and End 9 Variables 10 Arrays 11 Punctuation 12 Grand example 13 Options 14 Oneliner examples 15 See also 16 Books 17 External links Versions[edit] There are three major versions of awk: awk or Bell Labs awk nawk or new awk gawk (GNU awk) Both nawk and gawk will run awk programs without modification. Introduction[edit] Awk reads from a file or from its standard input, syntax error and outputs to its standard output. You will generally want to redirect that into a file, but that is not done in these examples just because it takes up space. awk does not get along with non-text files, like executables and FrameMaker files. If you need to edit those, use a binary editor like hexl-mode in emacs. A frustrating thing about trying to learn awk is getting your awk syntax error program past the shell's parser. The proper way is to use single quotes around the program, like so: >awk '{print $0}' filename The single quotes protect almost everything from the shell. In csh or tcsh, you still have to watch out for exclamation marks, but other than that, you're safe. Another frustrating thing about trying to learn awk is the lovely error messages: awk '{print $0,}' filename awk: syntax error near line 1 awk: illegal statement near line 1 gawk generally has better error messages. At least it tells you where in the line something went wrong: gawk '{print $0,}' filename gawk: cmd. line:1: {print $0,} gawk: cmd. line:1: ^ parse error So, if you're having problems getting awk syntax correct, switch to gawk for a while. Some basics[edit] Awk recognizes the concepts of "file", "record", and "field". A file consists of records, which by default are the lines of the file. One line becomes one record. Awk operates on one record at a time. A record consists of fields, which by default are separated by any number of spaces or tabs. Field number 1 is accessed with $1, field 2 with $2, and so forth. $0 refers to the whol