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Bash foreach loop
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Something like this would do:
xargs cat <filenames.txt
The xargs program reads its standard input, and for each line of input runs the cat program with the input lines as argument(s).
If you really want to do this in a loop, you can:
for fn in `cat filenames.txt`; do
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Display filename before matching line
...e logfile* | xargs -I{} grep "init time" {} \dev\null | tee outputfilename.txt
Then the outputfilename.txt would be something like
./logsapp1/logfile.22102015: init time: 10ms
./logsapp1/logfile.21102015: init time: 15ms
./logsapp2/logfile.21102015: init time: 17ms
./logsapp2/logfile.22102015: in...
How do I migrate an SVN repository with history to a new Git repository?
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Create a users file (i.e. users.txt) for mapping SVN users to Git:
user1 = First Last Name <email@address.com>
user2 = First Last Name <email@address.com>
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You can use this one-liner to build a template from your existing SVN repository:
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Use JavaScript to place cursor at end of text in text input element
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<script type="text/javascript">
function SetEnd(txt) {
if (txt.createTextRange) {
//IE
var FieldRange = txt.createTextRange();
FieldRange.moveStart('character', txt.value.length);
FieldRange.collapse();
FieldRange.select...
Best practices with STDIN in Ruby?
...' to each line from STDIN
#these will all work:
# ./example.rb < input.txt
# cat input.txt | ./example.rb
# ./example.rb input.txt
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How do I test for an empty string in a Bash case statement?
... their own):
#!/bin/sh
echo -en "Enter string: "
read string
> finder.txt
echo "--" >> finder.txt
for file in `find . -name '*cgi'`
do
x=`grep -i -e "$string" $file`
case $x in
"" )
echo "Skipping $file";
;;
*)
echo "$file: " >> finder.txt
echo "$x" >> finde...
Batch file include external file for variables
...en use the following snippet to load them:
for /f "delims=" %%x in (config.txt) do (set "%%x")
This utilizes a similar trick as before, namely just using set on each line. The quotes are there to escape things like <, >, &, |. However, they will themselves break when quotes are used in th...
grep, but only certain file extensions
...nge of possibilites but the answer given below of grep -r --include=*.txt 'searchterm' ./ really explains the essence of the answer
– David Casper
Jan 27 '17 at 1:44
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Why should text files end with a newline?
...inated by newline will have a different effect than one without:
$ more a.txt
foo
$ more b.txt
bar$ more c.txt
baz
$ cat {a,b,c}.txt
foo
barbaz
And, as the previous example also demonstrates, when displaying the file on the command line (e.g. via more), a newline-terminated file results in a corre...
How to split a large text file into smaller files with equal number of lines?
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How about the split command?
split -l 200000 mybigfile.txt
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