The only general convention is that a zero exit status signifies success, whereas any non-zero exit status is a failure. Many — but certainly not all — command-line tools return exit code 1 for syntax error, i.e. you had too few arguments or an invalid option. Many — but, alas, not all — command-line tools … Read more
For Docker >= 1.10 see this PR, which follows standard chroot exit codes: 125: docker run itself fails 126: contained command cannot be invoked 127: if contained command cannot be found 128 + n Fatal error signal n: 130 = (128+2) Container terminated by Control-C 137 = (128+9) Container received a SIGKILL 143 = (128+15) … Read more
There are many ways to do this. You could use wildcards in double brackets: str=”/some/directory/file” if [[ $str == /* ]]; then echo 1; else echo 0; fi You can use substring expansion: if [[ ${str:0:1} == “/” ]] ; then echo 1; else echo 0; fi Or a regex: if [[ $str =~ ^/ … Read more
Try: my_command || { echo ‘my_command failed’ ; exit 1; } Four changes: Change && to || Use { } in place of ( ) Introduce ; after exit and spaces after { and before } Since you want to print the message and exit only when the command fails ( exits with non-zero value) … Read more