If you want to preserve the whitespace you could also try the split function. In Gnu Awk version 4 the split function accepts 4 arguments, where the latter is the separators between the fields. For instance, echo “a 2 4 6″ | gawk ‘ { n=split($0,a,” “,b) a[3]=7 line=b[0] for (i=1;i<=n; i++) line=(line a[i] b[i]) … Read more
sed -i ‘/^$/d’ foo This tells sed to delete every line matching the regex ^$ i.e. every empty line. The -i flag edits the file in-place, if your sed doesn’t support that you can write the output to a temporary file and replace the original: sed ‘/^$/d’ foo > foo.tmp mv foo.tmp foo If you … Read more
column(1) is your friend. $ column -t <<< ‘”option-y” yank-pop > “option-z” execute-last-named-cmd > “option-|” vi-goto-column > “option-~” _bash_complete-word > “option-control-?” backward-kill-word > “control-_” undo > “control-?” backward-delete-char > ‘ “option-y” yank-pop “option-z” execute-last-named-cmd “option-|” vi-goto-column “option-~” _bash_complete-word “option-control-?” backward-kill-word “control-_” undo “control-?” backward-delete-char
You can use the -i flag which makes your pattern case insensitive: grep -iF “success…” file1 Also, there is no need for cat. grep takes a file with the syntax grep <pattern> <file>. I also used the -F flag to search for a fixed string to avoid escaping the ellipsis.
Another way to do it in AWK: awk ‘/PATTERN/ {for(i=1; i<=5; i++) {getline; print}}’ inputfile in sed: sed -n ‘/PATTERN/{n;p;n;p;n;p;n;p;n;p}’ inputfile in GNU sed: sed -n ‘/PATTERN/,+7p’ inputfile or sed -n ‘1{x;s/.*/####/;x};/PATTERN/{:a;n;p;x;s/.//;ta;q}’ inputfile The # characters represent a counter. Use one fewer than the number of lines you want to output.
You can use cut to access the second field: cut -f2 Edit: Sorry, didn’t realise that SVN doesn’t use tabs in its output, so that’s a bit useless. You can tailor cut to the output but it’s a bit fragile – something like cut -c 10- would work, but the exact value will depend on … Read more
What about the following: awk -F, ‘(NR==FNR){a[$1];next}!($1 in a)’ blacklist.csv candidates.csv How does this work? An awk program is a series of pattern-action pairs, written as: condition { action } condition { action } … where condition is typically an expression and action a series of commands. Here, the first condition-action pairs read: (NR==FNR){a[$1];next} if … Read more
The pipe (like redirection, or >) is a function of the shell, and so execing directly from Java won’t work. You need to do something like: /bin/sh -c “your | piped | commands | here” which executes a shell process with the command line (including pipes) specified after the -c (in quotes). Note also that … Read more
Use an Awk as below, awk ‘{ seen[$1] += $2 } END { for (i in seen) print i, seen[i] }’ file1 1486113768 9936 1486113769 6160736 1486113770 5122176 1486113772 4096832 1486113773 9229920 1486113774 8568888 {seen[$1]+=$2} creates a hash-map with the $1 being treated as the index value and the sum is incremented only for those … Read more
So, you don’t really want to be doing this with awk. Any of the popular high-level scripting languages — Perl, Python, Ruby, etc. — would do this in a way that was simpler and more robust. Having said that, something like this will work. Given input like this: this is a test (E.g., a row … Read more