What you are saying is true if both "arrow" operators are comparison operators; but it is not true when one of the "arrow" operators is a redirection operator. Historic versions of awk based on AT&T UNIX System utility code do one thing. GNU awk does the other.
IMHO you are mixing operator overloading with operator precedence...the left arrow stands for "input" while the right arrow tests for "greater than" is evident from the program's context and the rules of precedence and associativity have nothing to do with the interpretation of these operators...that being said the implied parenthesization of (getline < "f1" > 0) is ((getline < "f1") > 0)
---------- Post updated at 11:49 PM ---------- Previous update was at 11:42 PM ----------
Quote:
Originally Posted by greet_sed
Hi,
Do you mind explaining use of
in
You need "> 0" because if file f1 doesnt exist getline returns -1 which in awk terms is true thereby producing an infinite loop...
Hi,
I have two comma separated files. I would like to see field 1 value of File1 exact match in field 2 of File2. If the value matches, then it should print matched lines from File2. I have achieved the results using cut, paste and egrep -f but I would like to use awk as it is efficient way and... (7 Replies)
My item was not answered on previous thread as code given did not work
I wanted to print records from file2 where comparing column 1 and 16 for both files find rows where column 16 in file 1 does not match column 16 in file 2
Here was CODE give to issue
~/unix.com$ cat f1... (0 Replies)
Hello,
I have two files file 1 and file 2 each having result of a query on certain database tables and need to compare for Col1 in file1 with Col3 in file2, compare Col2 with Col4 and output the value of Col1 from File1 which is a) not present in Col3 of File2 b) value of Col2 is different from... (2 Replies)
I am looking to move matching lines (01 - 07) from File1 and 77 tab the matching string from File2, to File3.txt. I am almost done but
- Currently, script is not printing lines to File3.txt in order.
Thanks a lot.
Any help is appreciated.
Script I am using:
awk 'FNR == NR && ! /^]*$/ {... (9 Replies)
Trying to use awk to match the contents of each line in file1 with $5 in file2. Both files are tab-delimited and there may be a space or special character in the name being matched in file2, for example in file1 the name is BRCA1 but in file2 the name is BRCA 1 or in file1 name is BCR but in file2... (6 Replies)
I am trying to modify and understand an awk written by @Scrutinizer
The below awk will filter a list of 30,000 lines in the tab-delimited file. What I am having trouble with is adding a condition to SVTYPE=CNV
that will only print that line if CI=,0.95: portion in blue in file is <1.9.
The... (2 Replies)
In the awk below I am trying to print only the header lines starting with # or ## and the lines that $7 is PASS and AF= is less than 5%. The awk does execute but returns an empty file and I am not sure what I am doing wrong. Thank you.
file
... (0 Replies)
I am trying to use awk to print lines that satisfy either of the two conditions below:
condition 1: $2 equals CNV and the split of $3, the value in red, is greater than or equal to 4. ---- this is a or so I think
condition 2: $2 equals CNV and the split of $3, the value in red --- this is a... (4 Replies)
Discussion started by: cmccabe
4 Replies
LEARN ABOUT MINIX
diff
DIFF(1) General Commands Manual DIFF(1)NAME
diff - print differences between two files
SYNOPSIS
diff [-c | -e | -C n] [-br]file1 file2
OPTIONS -C n Produce output that contains n lines of context
-b Ignore white space when comparing
-c Produce output that contains three lines of context
-e Produce an ed-script to convert file1 into file2
-r Apply diff recursively to files and directories of
EXAMPLES
diff file1 file2 # Print differences between 2 files
diff -C 0 file1 file2
# Same as above
diff -C 3 file1 file2
# Output three lines of context with every
diff -c file1 file2 # Same
diff /etc /dev # Compares recursively the directories /etc and /dev
diff passwd /etc # Compares ./passwd to /etc/passwd
DESCRIPTION
the same name, when file1 and file2 are both directories" difference encountered"
Diff compares two files and generates a list of lines telling how the two files differ. Lines may not be longer than 128 characters. If
the two arguments on the command line are both directories, diff recursively steps through all subdirectories comparing files of the same
name. If a file name is found only in one directory, a diagnostic message is written to stdout. A file that is of either block special,
character special or FIFO special type, cannot be compared to any other file. On the other hand, if there is one directory and one file
given on the command line, diff tries to compare the file with the same name as file in the directory directory.
SEE ALSO cdiff(1), cmp(1), comm(1), patch(1).
DIFF(1)