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How to read from a file or STDIN in Bash?
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Here is the simplest way:
#!/bin/sh
cat -
Usage:
$ echo test | sh my_script.sh
test
To assign stdin to the variable, you may use: STDIN=$(cat -) or just simply STDIN=$(cat) as operator is not necessary (as per @mklement0 comment).
To parse each line fro...
How to make “if not true condition”?
I would like to have the echo command executed when cat /etc/passwd | grep "sysa" is not true.
6 Answers
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Python concatenate text files
...e ['file1.txt', 'file2.txt', ...] . I want to write a Python script to concatenate these files into a new file. I could open each file by f = open(...) , read line by line by calling f.readline() , and write each line into that new file. It doesn't seem very "elegant" to me, especially the part w...
Pseudo-terminal will not be allocated because stdin is not a terminal
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Try ssh -t -t(or ssh -tt for short) to force pseudo-tty allocation even if stdin isn't a terminal.
See also: Terminating SSH session executed by bash script
From ssh manpage:
-T Disable pseudo-tty allocation.
-t Force pseudo-tty allocation. This can be used to execute a...
Linux command or script counting duplicated lines in a text file?
...e same as borribles' but if you add the d param to uniq it only shows duplicates.
sort filename | uniq -cd | sort -nr
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How to capitalize the first letter of a String in Java?
... @dutt: No actually, that was perfectly fine too. But Rekin's modification made it perfect. ;)
– Adeel Ansari
Oct 11 '10 at 8:42
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How do you create different variable names while in a loop? [duplicate]
...ou can do this is with exec(). For example:
for k in range(5):
exec(f'cat_{k} = k*2')
>>> print(cat_0)
0
>>> print(cat_1)
2
>>> print(cat_2)
4
>>> print(cat_3)
6
>>> print(cat_4)
8
Here I am taking advantage of the handy f string formatting in Py...
How can I parse a YAML file from a Linux shell script?
...n't work for all YAML, you're right. That's why I opened with a few qualifications. I just shared what worked for my use case, since it answered the question better than any other at the time. This can definitely be expanded.
– Curtis Blackwell
Nov 27 '13 at 13...
Why are these numbers not equal?
...presented exactly in binary?
Is floating point math broken?
Canonical duplicate for "floating point is inaccurate" (a meta discussion about a canonical answer for this issue)
Comparing scalars
The standard solution to this in R is not to use ==, but rather the all.equal function. Or rather, sinc...
How to extract one column of a csv file
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yes. cat mycsv.csv | cut -d ',' -f3 will print 3rd column.
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