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Bash script - variable content as a command to run
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You just need to do:
#!/bin/bash
count=$(cat last_queries.txt | wc -l)
$(perl test.pl test2 $count)
However, if you want to call your Perl command later, and that's why you want to assign it to a variable, then:
#!/bin/bash
count=$(cat last_queries.txt | wc -l)
v...
In R, how to get an object's name after it is sent to a function?
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Perhaps it should be: print.foo=function(x){ cat(deparse(substitute(x))) } or print.foo=function(x){ print(deparse(substitute(x)), quote=FALSE) }
– IRTFM
Nov 30 '13 at 18:58
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An efficient way to transpose a file in Bash
...t coincidentally pretties-up the output a bit for this particular case.
$ cat tst.awk
BEGIN { FS=OFS="\t" }
{
for (rowNr=1;rowNr<=NF;rowNr++) {
cell[rowNr,NR] = $rowNr
}
maxRows = (NF > maxRows ? NF : maxRows)
maxCols = NR
}
END {
for (rowNr=1;rowNr<=maxRows;row...
C/C++中的段错误（Segmentation fault） - C/C++ - 清泛网 - 专注C/C++及内核技术
..., a segmentation fault occurs when a program attempts to access a memory location that it is not allowed to access, or attempts to access a memory location in a way that is not allowed (e.g., attempts to write to a read-only location, or to overwrite part of the operating system). Systems based on p...
How do I completely uninstall Node.js, and reinstall from beginning (Mac OS X)
....nodejs.node.pkg.bom >> ~/filelist.txt
Manually review your file (located in your Home folder)
~/filelist.txt
Then delete the files:
cat ~/filelist.txt | while read f; do sudo rm /usr/local/${f}; done
sudo rm -rf /usr/local/lib/node /usr/local/lib/node_modules /var/db/receipts/org.nodejs.*...
Which is better option to use for dividing an integer number by 2?
... answered May 21 '12 at 7:56
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Regex Pattern to Match, Excluding when… / Except between
...to be more obscure, you could use (*SKIP)(?!)
demo for this version
Applications
Here are some common problems that this technique can often easily solve. You'll notice that the word choice can make some of these problems sound different while in fact they are virtually identical.
How can I ma...
In Docker, what's the difference between a container and an image? [duplicate]
... opt proc root run sbin srv sys tmp usr var
root@48cff2e9be75:/# cat > foo
This is a really important file!!!!
root@48cff2e9be75:/# exit
Don't expect that file to stick around when you exit and restart the image. You're restarting from exactly the same defined state as you started in ...
Assignment in an if statement
...effects within a condition, but the alternatives usually involve code duplication, and when you know this pattern it's easy to get right.
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List files in local git repo?
...ng the ID/SHA-1 of the directory that you want to explore and then use git cat-file -p [ID/SHA-1 of directory]. For example:
git cat-file -p 14032aabd85b43a058cfc7025dd4fa9dd325ea97
100644 blob b93a4953fff68df523aa7656497ee339d6026d64 glyphicons-halflings-regular.eot
100644 blob 94fb5490a2ed10b2...