대체폰트지정하기 › jetty › 사랑 › WindowsXPShutdown명령 › LangChain › awk
- text processing language
- cut fixed length data
1 특별한 의미를 가지는 변수들 #
FS : 필드 구분자(정규식), 기본값은 공백(탭포함) -F 옵션으로 지정가능 (예: -F":") NF : 현재 레코드에서의 필드 개수 NR The ordinal number of the current record from the start of input. Inside a BEGIN action the value is zero. Inside an END action the value is the number of the last record processed. FNR The ordinal number of the current record in the current file. Inside a BEGIN action the value is zero. Inside an END action the value is the number of the last record processed in the last file processed. FILENAME A pathname of the current input file. RS The input record separator; a newline character by default. OFS The print statement output field separator; a space character by default. ORS The print statement output record separator; a newline character by default. OFMT Output format for numbers (default %.6g). If the value of OFMT is not a floating-point format specification, the results are unspecified. CONVFMT Internal conversion format for numbers (default %.6g). If the value of CONVFMT is not a floating-point format specification, the results are unspecified. SUBSEP The subscript separator string for multi- dimensional arrays; the default value is "\034" ARGC The number of elements in the ARGV array. ARGV An array of command line arguments, excluding options and the program argument numbered from zero to ARGC-1. The arguments in ARGV can be modified or added to; ARGC can be altered. As each input file ends, awk will treat the next non-null element of ARGV, up to the current value of ARGC-1, inclusive, as the name of the next input file. Thus, setting an element of ARGV to null means that it will not be treated as an input file. The name - indicates the standard input. If an argument matches the format of an assignment operand, this argument will be treated as an assignment rather than a file argument. ENVIRON Array of environment variables; subscripts are names. For example, if environment variable V=thing, ENVIRON["V"] produces thing. RSTART The starting position of the string matched by the match function, numbering from 1. This is always equivalent to the return value of the match function. RLENGTH The length of the string matched by the match function.