Example Analysis of basic parameters of awk
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Awk is good at manipulating files one line at a time, reading one line at a time, and then acting accordingly. The basic syntax format of awk when reading a single file is awk 'BEGIN {OFS=FS= "\ t"} {print $0, $1;}' filename's syntax when reading multiple files is awk...
Awk is good at manipulating files one line at a time, reading one line at a time, and then acting accordingly.
The basic syntax format for awk to read a single file is
Awk 'BEGIN {OFS=FS= "\ t"} {print $0, $1;}' filename
The syntax when reading multiple files is
Awk 'BEGIN {OFS=FS= "\ t"} ARGIND==1 {print $0, $1;} ARGIND==2 {}' file1 file2
The command part after the awk is enclosed in quotation marks, which can be single quotation marks or double quotation marks, but be careful not to be the same as the quotation marks used in the internal command, otherwise the nearest quotation marks will be regarded as a group, causing an interpretation error.
OFS: column delimiter (output field separtor) for file output
FS: column delimiter (field separtor) when the file is imported
BEGIN: set initial parameters, initialize variables
END: do the final processing after reading the file
Other {}: loop through every line of the file
$0 represents a line of content; $1, $2, … $NF represents the first column, the second column to the last column.
How many columns are there in the NF (number of fields) file; how many lines have been read in the NR (number of rows) file: how many lines have been read in the current FNR file, which is often used in multi-file operations.
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