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Execute bash script from URL
Say I have a file at the URL "http://mywebsite.com/myscript.txt" that contains a script:
14 Answers
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When to wrap quotes around a shell variable?
... the literal single-quoted string.)
Wildcard expansion:
$ pattern='file*.txt'
$ ls $pattern
file1.txt file_other.txt
By contrast:
$ ls "$pattern"
ls: cannot access file*.txt: No such file or directory
(There is no file named literally file*.txt.)
$ ls '$pattern'
ls: cannot access $patte...
How to get process ID of background process?
...ses you if foo happens to be multiple piped commands (eg. tail -f somefile.txt | grep sometext). In such cases, you will get the PID of the grep command from $! rather than the tail command if that's what you were looking for. You will need to use jobs or ps or the likes in this instance.
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Add up a column of numbers at the Unix shell
Given a list of files in files.txt , I can get a list of their sizes like this:
20 Answers
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“#include” a text file in a C program as a char[]
...ar[] created by xxd isn't NULL-terminated! so I do $ xxd -i < file.txt > file.xxd $ echo ', 0' >> file.xxd and in the main.c char file_content[] = { #include "file.xxd" };
– ZeD
Jan 4 '09 at 16:10
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Deleting lines from one file which are in another file
...t[tolower($0)]=1; next } { if (! list[tolower($0)]) print }' exclude-these.txt from-this.txt
The output will be in the same order as the "from-this.txt" file. The tolower() function makes it case-insensitive, if you need that.
The algorithmic complexity will probably be O(n) (exclude-these.txt s...
What are the differences among grep, awk & sed? [duplicate]
...ition:
grep: search for specific terms in a file
#usage
$ grep This file.txt
Every line containing "This"
Every line containing "This"
Every line containing "This"
Every line containing "This"
$ cat file.txt
Every line containing "This"
Every line containing "This"
Every line containing "That"
Ev...
How to merge two files line by line in Bash
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You can use paste:
paste file1.txt file2.txt > fileresults.txt
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C/C++ with GCC: Statically add resource files to executable/library
... linked in with the rest of our code.
Let's say we have a file name data.txt that we want to embed in our executable:
# cat data.txt
Hello world
To convert this into an object file that we can link with our program we just use objcopy to produce a ".o" file:
# objcopy --input binary \
--outpu...
How to read file contents into a variable in a batch file?
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Read file contents into a variable:
for /f "delims=" %%x in (version.txt) do set Build=%%x
or
set /p Build=<version.txt
Both will act the same with only a single line in the file, for more lines the for variant will put the last line into the variable, while set /p will use the first.
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