echo meaning in unix and x x

What do [ -r $1 ] and [ ! -r $1 ] mean in Bash? - Stack Overflow

20 дек. 2019 г. ... ... xx.sh either in the current directory of in the sub-directory. #!/bin/bash function aa { if [ ! -r $1 ] then echo "not exist" else echo ...

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How to replace values in a string using sed but keep the string intact ...

3 дек. 2015 г. ... How to replace values in a string using sed but keep the string intact? For example echo "01XX1234". I'm looking to replace XX with a hex value ...

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Unix command from sas program - SAS Support Communities

27 окт. 2014 г. ... %let csvfilename=&start_dir./star/sun/xx.csv;. Then you can use that: X "COUNT=`cat &csvfilename.|wc -l`;echo `expr $COUNT - 1` ...

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Bash Reference Manual

19 сент. 2022 г. ... ... Unix Specification, version 3. See Bash Builtin Commands, for a description of the escape sequences that echo recognizes. The file config ...

www.gnu.org

Unix Command Summary

Unix Command Summary ... shell script mycommand executable, we do this % chmod +x mycommand ... echo. The echo command echoes its arguments. Here are some examples:

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Help me with Echo Command - UNIX and Linux Forums

6 нояб. 2012 г. ... ... xx.xx.xxx.xx/12210/12210': 'CONNECTION_REFUSED [os error=150, line 1687 of URL.cpp]: Error connecting to host xx.xx.xxx.xx:12210'" >> errors.

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shell - What does `set -x` do? - Stack Overflow

29 мар. 2016 г. ... Example. set -x echo $(expr 10 + 20) + expr 10 + 20 + echo 30 30. set +x echo $(expr 10 + 20) 30. Above example illustrates the usage of set -x ...

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shell - Why is setting a variable before a command legal in bash ...

28 апр. 2014 г. ... The remaining words are passed as arguments to the invoked command. So you can pass any variable you'd like. Your echo example does not work ...

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How to use inputs in your shell scripts | Enable Sysadmin

19 апр. 2022 г. ... Notice that the script interprets bb cc xx ... #!/bin/bash echo "We received $# argument(s) ... Every Linux user has a favorite single-line command.

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linux - Append line to /etc/hosts file with shell script - Stack Overflow

12 окт. 2013 г. ... ... xx.xx venus.example.com venus" /etc/hosts. Otherwise, echo "192.241.xx.xx venus.example.com venus" >> /etc/hosts. would append the line at the ...

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