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How to go to each directory and execute a command?
...t actually care in which directory you execute them. for f in foo bar; do cat "$f"/*.txt; done >output is functionally equivalent to cat foo/*.txt bar/*.txt >output. However, ls is one command that does produce slightly different output depending on how you pass it arguments; similarly, a gr...
How to remove the lines which appear on file B from another file A?
...s>
works on non-sorted files
maintains the order
is POSIX
Example:
cat <<EOF > A
b
1
a
0
01
b
1
EOF
cat <<EOF > B
0
1
EOF
grep -Fvxf B A
Output:
b
a
01
b
Explanation:
-F: use literal strings instead of the default BRE
-x: only consider matches that match the entire...
Why does the order in which libraries are linked sometimes cause errors in GCC?
...o see real command lines).
Common files shared by all below commands
$ cat a.cpp
extern int a;
int main() {
return a;
}
$ cat b.cpp
extern int b;
int a = b;
$ cat d.cpp
int b;
Linking to static libraries
$ g++ -c b.cpp -o b.o
$ ar cr libb.a b.o
$ g++ -c d.cpp -o d.o
$ ar cr libd.a d.o
$ ...
How to filter None's out of List[Option]?
...
The cats library also has flattenOption, which turns any F[Option[A]] into an F[A] (where F[_] is a FunctorFilter)
import cats.implicits._
List(Some(1), Some(2), None).flattenOption == List(1, 2)
...
Convert dmesg timestamp to custom date format
...
15:54:05 up 371 days, 19:09, 4 users, load average: 3.41, 3.62, 3.57
# cat /proc/uptime
32123362.57 638648955.00
Accounting for the CPU uptime being in milliseconds, there's an offset of nearly 5 1/2 hours here. So I revised the script and converted it to native bash in the process:
dmesg_wit...
How do I make a Git commit in the past?
...se git add, but you would first need to copy the file from some external location to the expected path (--index-filter runs its command in a temporary GIT_WORK_TREE that is empty).
If you want your new file to be added to every existing commit, then you can do this:
new_file=$(git hash-object -w p...
How do you easily horizontally center a using CSS? [duplicate]
...answered Nov 4 '15 at 7:54
wh1t3cat1kwh1t3cat1k
2,97255 gold badges2727 silver badges3535 bronze badges
...
Have bash script answer interactive prompts [duplicate]
...
I found the best way to send input is to use cat and a text file to pass along whatever input you need.
cat "input.txt" | ./Script.sh
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How to programmatically determine the current checked out Git branch [duplicate]
...
Do not use cat .git/refs/heads/branch; use git rev-parse --verify refs/heads/branch. Refs can be packed, and the solution with cat would fail.
– Jakub Narębski
Nov 1 '09 at 9:06
...
How to tell which commit a tag points to in Git?
...tags. On Windows use git rev-parse --verify %TAG%^^^^{commit} (four hats).
cat .git/refs/tags/* or cat .git/packed-refs (answer) depending on whether or not the tag is local or fetched from remote.
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