shell - Read For Learn

Pseudo-terminal will not be allocated because stdin is not a terminal

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:

Shell: How to call one shell script from another shell script?

There are a couple of different ways you can do this: Make the other script executable, add the #!/bin/bash line at the top, and the path where the file is to the $PATH environment variable. Then you can call it as a normal command; Or call it with the source command (alias is .), like this:source /path/to/script Or use the bash command to execute … Read more

Diff command along with Grep gives “Binary file (standard input) matches”

From man grep: -a, –text Process a binary file as if it were text; this is equivalent to the –binary-files=text option. –binary-files=TYPE If the first few bytes of a file indicate that the file contains binary data, assume that the file is of type TYPE. By default, TYPE is binary, and grep normally outputs either a … Read more

Shell script “for” loop syntax

Brace expansion, {x..y} is performed before other expansions, so you cannot use that for variable length sequences. Instead, use the seq 2 $max method as user mob stated. So, for your example it would be:

How to remove the quotes when reading a variable in jq in shell?

Given a JSON file, arguments.json: When calling reading the variables as such: [out]: The variable contains the quotation marks “”. How to remove the quotes when reading a variable in jq? I could use sed to strip the quotes as such: [out]:

Which characters need to be escaped when using Bash?

There are two easy and safe rules which work not only in sh but also bash. 1. Put the whole string in single quotes This works for all chars except single quote itself. To escape the single quote, close the quoting before it, insert the single quote, and re-open the quoting. sed command: sed -e “s/’/’\\\\”/g; 1s/^/’/; \$s/\$/’/” 2. … Read more

adb shell su works but adb root does not

By design adb root command works in development builds only (i.e. eng and userdebug which have ro.debuggable=1 by default). So to enable the adb root command on your otherwise rooted device just add the ro.debuggable=1 line to one of the following files: If you want adb shell to start as root by default – then add ro.secure=0 as well. Alternatively you could use modified adbd binary (which does not check for ro.debuggable) From https://android.googlesource.com/platform/system/core/+/master/adb/daemon/main.cpp