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bash: shortest way to get n-th column of output
...e X in your .zshrc to be
alias -g X="| cut -d' ' -f2"
then you can do:
cat file X
You can take it one step further and define it for the nth column:
alias -g X2="| cut -d' ' -f2"
alias -g X1="| cut -d' ' -f1"
alias -g X3="| cut -d' ' -f3"
which will output the nth column of file "file". You...
Propagate all arguments in a bash shell script
...@ if you actually wish your parameters to be passed the same.
Observe:
$ cat foo.sh
#!/bin/bash
baz.sh $@
$ cat bar.sh
#!/bin/bash
baz.sh "$@"
$ cat baz.sh
#!/bin/bash
echo Received: $1
echo Received: $2
echo Received: $3
echo Received: $4
$ ./foo.sh first second
Received: first
Received: secon...
How can I find out the total physical memory (RAM) of my linux box suitable to be parsed by a shell
...
Have you tried cat /proc/meminfo? You can then awk or grep out what you want, MemTotal e.g.
awk '/MemTotal/ {print $2}' /proc/meminfo
or
cat /proc/meminfo | grep MemTotal
...
What are the differences among grep, awk & sed? [duplicate]
...aining "This"
Every line containing "This"
Every line containing "This"
$ cat file.txt
Every line containing "This"
Every line containing "This"
Every line containing "That"
Every line containing "This"
Every line containing "This"
Now awk and sed are completly different than grep.
awk and sed ar...
PostgreSQL: How to make “case-insensitive” query
... It's important to note that using LOWER (or any function) on the predicate columns--in this case "name"--will cause any indexes to no longer be seekable. If this is a large or frequently queried table, that could cause trouble. Case-insensitive collation, citext, or a function-based index will ...
Why use softmax as opposed to standard normalization?
... # blurry image of a ferret
[0.26894142, 0.73105858]) # it is a cat perhaps !?
>>> softmax([10,20]) # crisp image of a cat
[0.0000453978687, 0.999954602]) # it is definitely a CAT !
And then compare it with standard normalisation
>>> std_norm([1,2]) ...
Bash: infinite sleep (infinite blocking)
...
sleep infinity does exactly what it suggests and works without cat abuse.
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Unix tail equivalent command in Windows Powershell
... click on the file in Windows Explorer, suddenly PowerShell "wakes up" and catches up the remaining lines. Is this a bug?
– JoshL
Oct 9 '12 at 22:32
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How to pretty print XML from the command line?
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Note that the "cat data.xml | xmllint --format - | tee data.xml" does not work. On my system it sometimes worked for small files, but always truncated huge files. If you really want to do anything in place read backreference.org/2011/01/29/...
How to get the first line of a file in a bash script?
...
@sorin, cat ... | read VAR will fail in most shells (all except zsh as far as I know) because each of the components in a pipe will run in separate subshells. Meaning that $VAR will be set in subshell (that cease to exist as soon as ...